Harmless in the Tin: Phosphide Fumigants, Three Homes, and Where the Rules Stop

1. Introduction: a product that is safe until it is not

Most pesticides this journal examines are hazardous in the container and less so once applied. This one is the reverse: inert in a sealed tin and lethal once the air reaches it.

1.0b And its danger is delayed and invisible

Nothing happens when the pellets are placed. The hazard develops afterwards, as moisture reaches them, in a space where people may already be living.³

1.1 Which is why it works

A gas reaches every crevice of a grain store or a burrow system, which is the property that makes it effective and the one that makes it dangerous near people.

1.1b And it has killed children on both sides of the border

Two in Utah, two in Alberta and four in Texas, in incidents spread across seven years.²¹⁰⁶

1.2 What this article argues

That the regulatory response to a professional's misuse removed residential use, that the later deaths involved product that never passed through the profession, and that ordinary household instincts made each of those worse. Sections 18, 19 and 20 are the case.

2. What it is used for

Two quite different jobs.

Labels describe the product as used to protect stored commodities from damage by insects and, in limited areas, to control burrowing vertebrate pests.³

2.0a A fumigant for enclosed commodities

Grain, feed and stored products in containers, bins and holds, which are spaces people are meant to stay out of while the gas works.⁷

2.0b And in shipping

A poison centre director told reporters that exposures are more often seen in adults, because the product is used in industrial shipping, including in ship holds carrying grain, where someone entering before the space has been aired can collapse or die.¹³

2.0c Not a rare exposure, but rare deaths

In her words, exposure to it is not rare, but deaths like the one in Texas are.¹³

2.1 In Canada, principally grain

National reporting describes phosphine as used here in grain storage, administered by trained users.¹⁰

3. How it works

Aluminium phosphide fumigants are acted upon by atmospheric moisture to produce phosphine gas, and pellets and partially spent dust will release it on contact with moisture from the air, water, acids and many other liquids.³

3.0a Water is only the fastest route

Humid air is enough to start the reaction, so a product left out in a home releases gas without anybody adding anything to it.³

3.0b The label treats even opening the container as a hazard

Recommending that containers be opened in open air or near a fan exhausting outdoors, and warning that piled tablets can heat up and confine the gas so that ignition could occur.¹⁶

3.0c And it kills everything in a burrow

The label states that non-target organisms exposed to phosphine in burrows will be killed, which is what a fumigant does to every animal sharing the space.¹⁶

3.1 And it can ignite

The gas may ignite spontaneously in air at concentrations above its lower flammable limit of 1.8 per cent by volume.³

4. Why it is restricted

The highest toxicity class.

The American regulator lists aluminium phosphide in Toxicity Category I, the most toxic category, pointing specifically to acute effects via the inhalation route.⁶ Labels carry a restricted use designation due to high acute inhalation toxicity of phosphine gas.⁴

4.0b And the restriction is about the gas, not the pellet

The restricted use designation is stated as due to the high acute inhalation toxicity of phosphine, which is what the pellet becomes rather than what it is.⁴

4.1 And in Canada it is sold only to licence holders

Health Canada stated that such pesticides are restricted here, meaning they can only be sold to individuals holding an appropriate certificate or licence.¹¹

4.1b And in Alberta it is scheduled

A provincial spokeswoman said aluminium phosphide is listed as a Schedule 1 substance there, which governs its availability and use.¹¹

4.2 There is no antidote

A university toxicologist told reporters there is no antidote for the poison, and that it can cause long-term damage to the liver, heart and kidneys.¹¹

5. Utah, 2010

Two sisters, aged four and fifteen months, died in February 2010 after an applicator treated the family's lawn in Layton, Utah, for rodent burrows. Investigators believed phosphine from the pellets seeped into the home, and the medical examiner found lung damage consistent with inhaling a harmful substance.²

5.1 A treatment for burrowing rodents

Rodent burrows on a residential lawn, which is exactly the burrowing vertebrate use the label then permitted and now prohibits near homes.²³

5.2 And the gas travelled from the burrows into the house

Which is the mechanism the 100-foot rule now addresses: a burrow system is not sealed, and gas in it can follow the soil into a foundation.²

The second clause is our reading of why distance was chosen as the remedy.

6. What the regulator found

At state level.

State investigators determined that the applicator operated in a faulty, careless or negligent manner by misapplying a highly toxic restricted use pesticide, and the state agency was reported to be allowed only to file civil penalties.⁵

6.0b Civil penalties only, for a double fatality

Which is the enforcement ceiling a pesticide regulator works within, however serious the outcome, and leaves criminal questions to other authorities.⁵

The second clause is our reading.

6.1 A licensed professional

Which is what distinguishes this incident from the two that follow.

7. What the national regulator did

Within two months the American regulator announced new restrictions that prohibit all uses of the products around residential areas and increase buffer zones for treatment around non-residential buildings that could be occupied by people or animals from 15 feet to 100 feet.¹

7.0a Aimed at both halves of the problem

Where the product may be used, through the residential prohibition and the buffer, and how each use must be planned, through the written management plan.¹

7.0b Within weeks

The deaths occurred in February and the restrictions were announced on 7 April.²

7.1 And a written plan before every application

Fumigant management plans became required before all applications of phosphine products, including burrowing pest fumigations, describing the steps for a safe, legal and effective fumigation.¹

8. The label that resulted

In capital letters on current products.

For burrowing rodent applications, the use of this product is strictly prohibited within 100 feet of any building where humans and/or domestic animals do or may reside on single and multi-family residential properties, nursing homes, schools except athletic fields, day care facilities and hospitals.³

8.0b The list names the places children are

Homes, schools, day care facilities and hospitals, which is the population the Utah deaths made visible.³

8.0c With one exception worth noting

Athletic fields are excluded from the school prohibition, and one advocacy source objected that exposure would continue through uses on athletic fields and playgrounds and around non-residential buildings.³¹

8.1 Registrants were directed to amend

One state regulator recorded that the national agency directed all registrants to amend their labelling in response to the two deaths.⁴

9. Which is a site prohibition

Our reading.

The response did not tighten how the product may be applied near a home. It removed the home as a permitted site, which is the strongest form a label restriction can take.

9.0b Because distance alone had not worked

The Utah treatment was on the family's own lawn, so a rule allowing residential use at a greater distance would still have placed the product on residential property. Removing the site removed that possibility entirely.

That reasoning is ours.

9.0c Which trades flexibility for certainty

An applicator can no longer judge whether a particular residential site is safe enough. The answer is fixed in advance, which removes the judgement that failed.

9.1 And the state interpretation was strict

One state held that the labelling prohibits use on any residential property, even where part of it produces food or livestock for the household's own consumption.⁴

10. Fort McMurray, 2015

The Canadian case.

An eight-month-old girl died in February 2015 after exposure to phosphine used to kill bed bugs in an apartment in Fort McMurray, Alberta, and her two-year-old brother died days later.⁹¹⁰

10.0b For bed bugs

Which places this case in a category this journal has written about at length, and adds a failure mode our bed bug articles did not consider: a household treating an infestation itself with an agricultural fumigant brought from abroad.⁹

10.0c And the pressure behind it is familiar

Our bed bug cost and stigma articles described the pressure households feel, which can make any product that promises results seem reasonable. That connection is ours, and we make no claim about this family's reasons.

10.1 Other children were critically ill

Four siblings were hospitalised, two on ventilators in Edmonton.⁹

11. How it reached the apartment

Outside every Canadian channel.

The insecticide was brought into Canada illegally from Pakistan to fight a bedbug infestation, according to a family member, and firefighters found an unmarked container of phosphine in the home.⁹¹⁰

11.0b And border and police agencies became involved

The Canada Border Services Agency said it was working with the RCMP on the case, though neither would comment on whether charges could be laid.¹¹

11.1 Where it is approved for other uses

National reporting noted that outside Canada phosphine has been approved for use in other contexts.¹⁰

11.1b Familiar where it came from

Which is the difficulty: a product used routinely in one country may carry no warning signal at all to somebody who has seen it used there.

That reading is ours.

11.2 And imported pesticides must be registered here

Health Canada's position is that imported pesticides must be regulated under the Pest Control Products Act and bear a Canadian label.¹¹

12. The vacuum

The detail that matters most for prevention.

The green tablets were placed around the apartment, particularly in one bedroom, and when the mother vacuumed the floor, some of the toxic material was disturbed, broke down and became airborne, according to a deputy fire chief.¹²

12.0b Indoors, in a closed apartment, in February

A northern winter keeps windows closed and ventilation low, which is the condition under which any gas released indoors builds up rather than dispersing.

That point is ours.

12.1 And the gas accumulated over days

Reporting described phosphine as a colourless gas that would have accumulated in the apartment over a number of days.⁹

12.2 Unintentionally, and understandably

Cleaning a floor where children play is an ordinary thing to do, and nothing about the tablets would have indicated that disturbing them released more gas.

13. Why children

An observation from the scene.

Phosphine is a heavy gas and would have affected children playing on the floor more than the adults in the apartment, a deputy fire chief said.¹¹

13.0a Children also spend more time close to the floor

Playing, crawling and sleeping at low level, which in the Alberta case was the height where a heavy gas would concentrate.¹¹

13.0b And smaller bodies receive more per kilogram

A child breathing the same air as an adult takes in more relative to body size, which would compound the effect of being closer to the floor.

That is general physiology rather than a sourced figure.

13.1 Which fits every incident here

All eight who died across the three cases were children.

That observation is ours, drawn from the reported facts.²⁶¹⁰

14. Amarillo, 2017

The largest loss.

Four children aged seven to seventeen died in January 2017 after aluminium phosphide was applied under their family's mobile home in Amarillo, Texas, with ten people inside the home at the time and at least five others hospitalised.⁶

14.0b Others in the home survived

The mother was in critical condition and the father and four other children were treated in hospital.¹⁷¹³

14.1 First mistaken for something else

Responders originally thought the incident was related to carbon monoxide poisoning.⁷

15. How it reached the home

Through a friend.

The father told responders he had spread the pellets under the home after obtaining the product from a friend. A fire captain said the product is not available for sale to the general public, and that as far as he knew the father held no professional certification.⁷

15.0b A product meant for commodities

The product's manual describes it as intended for pest control in commercial transport or storage of commodities and animal feed, not for use at a dwelling of any kind.⁷

15.0c And sold only to certified users

Reporting named the pellets and noted they were only supposed to be sold to people with professional licences or certification.¹⁷

15.1 To kill mice

Officials said a resident was trying to kill mice and placed the pesticide under the home.⁷

16. The hose

The response that killed.

Phosphine was likely released when the father took a garden hose at some point Sunday and tried to rinse away some of the pellets because family members had complained of the smell.⁷ Aluminium phosphide mixed with water produces toxic phosphine gas.⁶

16.0b Ten people were in the home

Which is what turned a mistaken clean-up into a mass casualty event: the gas built up in an occupied dwelling between Sunday and early Monday morning.⁶¹³

16.1 The smell was the warning

The family noticed something wrong and responded to it, which is what anybody would want them to do. The response was the wrong one for this material.

16.2 And the reaction continued overnight

The hosing happened on Sunday, and a visitor found everyone sick early on Monday morning.⁷¹³

17. Three routes

One licensed applicator on a residential lawn, one family importing tablets from abroad, and one uncertified user supplied by a friend.

17.1 Each a different failure

Professional misjudgement near a dwelling, consumer import of a foreign product, and informal diversion of a professional product, which call for different controls.

17.2 And one common element

In each, the product was used where people lived, a setting the labels we examined exclude for burrow treatment and do not list among their permitted uses otherwise.³¹⁶

18. What the 2010 rules could reach

Our analysis.

A licensed applicator reads the label and is bound by it. The prohibition on residential use and the 100-foot buffer would have removed the Utah treatment from the permitted options.¹³

18.0a And it is enforceable after the fact

A licensed applicator who breaches the label can be penalised, as the Utah applicator was, which is a consequence that shapes the conduct of everybody else holding a licence.⁵

18.0b And the written plan adds a second check

A fumigant management plan requires the applicator and the property owner to characterise the area and set out safety requirements before application, which forces the question of what is nearby to be asked on paper.¹

18.1 Which is what a label is for

Directing the conduct of people who are trained to follow it and accountable when they do not.

19. And what they could not

The limit.

A family using tablets brought from another country has never seen a Canadian label. A household supplied by a friend may never have seen any label at all. Neither incident could have been prevented by anything written on a product the victims did not buy.

19.0a And a label cannot follow a product out of its packaging

Tablets in an unmarked container, as in the Alberta home, carry none of the warnings the original packaging bore.¹⁰

19.0b The label even anticipates a reader who needs help

It carries an instruction in Spanish that anybody unable to read English should not use the product until the label has been fully explained to them.¹⁶

19.0c And the Texas household never had that explanation

The father spoke to responders through a Spanish-language interpreter, and the product had come to him from a friend rather than through anybody positioned to explain it.⁷

19.0d We draw no conclusion about fault from this

Only that a label's safeguards, including its translated ones, travel with the label, and this product travelled without it.

19.1 So the later deaths are outside the reform

Not because the reform failed, but because it governed a channel the product had already left.

Sections 18 and 19 are ours.

20. The instincts that make it worse

In one home the family noticed a smell and washed the pellets with a hose. In the other the floor was vacuumed. The water started the chemical reaction that released the phosphine gas.¹³¹²

20.1 A smell is a reasonable prompt

Families acted on something they noticed, which is what safety advice usually asks people to do. What they lacked was knowledge of the one action that would make it worse.⁷

21. Which our hantavirus article met in another form

The same lesson.

That article found public guidance telling people never to sweep or vacuum rodent droppings, because dry cleaning lifts contaminated material into the air. Here a vacuum did the same to a fumigant, and water, which is the safe method for droppings, was the dangerous one.

21.0a Water helps with one and harms with the other

Wetting droppings keeps particles down. Wetting phosphide pellets releases gas. The same household action has opposite effects depending on a fact the household may not know.

21.0b And both articles found the same dry-cleaning danger

Vacuuming lifts hazardous material into the air whether the material is dried rodent excreta or a decomposing fumigant, which is the one rule the two cases share.¹²

21.1 So no single cleaning rule is safe

The right response depends entirely on what the material is, which is exactly what a household with an unlabelled product does not know.

22. The supply channel is the real control

Our argument.

For a product this dangerous, the restriction that matters most is who can obtain it. Certification, restricted sale and licensed supply keep it with people who know that water and vacuums are the wrong responses.

22.0a Certified users are where the knowledge reliably sits

Pest control companies and licensed farmers are trained on the product, and few people outside those groups have reason to know that water accelerates this reaction. The two later cases show what happens when the product arrives without that knowledge.¹¹

22.0b Because a trained user knows the failure modes

That the product must be kept dry until use, that spills are not washed, and that a treated space is aired from outside before anybody enters, which is the knowledge none of the later households had.³¹⁶

22.1 And the rules say so

Restricted to certified applicators and those under their supervision in one jurisdiction, and sold only to certificate or licence holders in Canada.⁵¹¹

23. And it leaks

In both of the later cases.

Through international travel in one and personal supply in the other. One provincial official noted that the product was only supposed to be used in the province by pest control companies and licensed farmers.¹¹

23.0a And the Texas supply chain is unclear

A fire captain said he did not know whether the friend who supplied the Texas product held certification, which leaves open whether it left the professional channel before or after reaching the friend.⁷

23.0b Neither leak is exotic

Bringing familiar products home from abroad and sharing supplies among friends are both ordinary behaviours, which is why a control that depends on neither happening will sometimes fail.

23.1 And a leak by air travel was a further risk

A community leader told reporters that had the tablets become wet in hand luggage on the flight, a whole aircraft could have been endangered.¹⁴

24. A small error in the retelling

Which this journal notices.

Reporting on the Texas deaths in January 2017 referred to the Canadian infant's death as having happened the previous year.⁸ Canadian reporting dates it to February 2015.⁹

24.0b Which matters because dates anchor patterns

A retelling that shifts one case by a year changes how close together the incidents appear, and a pattern assembled from misdated cases is harder to check.

24.1 A two-year gap reported as one

Which is minor, and the kind of drift our citation trail article found accumulating in retellings of facts that nobody rechecks.

25. What would help

Our suggestions.

Public guidance that says plainly, for any unknown pellet or tablet pesticide found in a home, to leave, ventilate from outside if it is safe to do so, and call emergency services, rather than to clean it up with water or a vacuum.

25.0 What a household should do on finding unknown pellets

Not touch, wet or sweep them, get everybody out, and call emergency services, which is advice that works for any unidentified chemical and does not depend on recognising this one.

That advice is ours and general rather than sourced.

25.0a Leave, then call

Getting people out of the space is the step that would have mattered in all three cases, and it requires no knowledge of the chemistry at all.

25.0b Water is the specific warning

Because it is the instinctive response to a spill and the one that most directly accelerates this reaction.⁶

25.1 And guidance reaching the communities involved

The Canadian case involved a product legal elsewhere and familiar to the family, which suggests outreach about what is and is not legal to bring home.

Both suggestions are ours.

26. What we take from it

Three things.

This product is safe in the tin and deadly in the air. Section 3.³

Label restrictions reach only the people who read labels. Section 19.

And the natural household responses make the hazard worse. Section 20.⁷¹²

26.1 And one thing we cannot take from it

How often phosphide products reach households outside the professional channel, since incidents are known only when they end in harm.

27. Our own position

The disclosure.

This company performs fumigation, which places it inside the professional channel this article describes. Two of the three incidents involved product that never passed through that channel, and the one that did involved a licensed applicator.

27.0b And the other two describe what a household does without us

Which is not an argument for professional service so much as a description of what the professional channel is there to prevent.

27.1 So the first lesson applies to us directly

The Utah case is the one where the person responsible held a licence, and the rules that followed were written for people like us.

28. The Manitoba position

28.1 This is a grain province

Which is where phosphine is principally used in Canada, in storage handled by trained users.¹⁰

28.1b Where the product is meant to stay with licensed users

In the neighbouring province it is supposed to be used only by pest control companies and licensed farmers, and we did not establish whether Manitoba's rules are the same.¹¹

28.2 The Canadian case was in a neighbouring province

And involved bed bugs, which our articles describe as common in multi-unit housing here.

28.2b And the same pressure exists here

Households struggling with bed bugs and rodents may reach for any product that promises to kill everything, which our consumer product articles found for foggers and other home remedies. That is our inference about risk rather than a local finding.

28.3 What we could not find

Manitoba's specific restrictions on phosphide products, whether any residential phosphine incident has occurred here, and the content of Health Canada's 2010 re-evaluation note on aluminium and magnesium phosphide, which a Canadian environmental health summary cites.¹⁵

29. Limitations and open questions

This article is built from incident reporting. The three cases are reconstructed from news accounts, an advocacy blog, a trade news item and a state regulatory letter, not from investigation reports or court records.²⁶⁹

That is the most important limitation because details in the early days after each incident, such as who applied what and how, can change as investigations conclude.

Two sources are advocacy material. The account of the 2010 restrictions and the state penalty finding come from an organisation campaigning against pesticide use.¹⁵

The Canadian regulatory position is incomplete. We did not read the 2010 Canadian re-evaluation note and cannot say whether Canada adopted buffers like the American ones.¹⁵

The heavy gas statement is a fire official's. We cite it as reported and did not check the gas's density.¹¹

The victims are not named here. News sources name them; we have chosen not to.

Sections 9, 13.1, 18, 19, 21, 22 and 25 are our reasoning. The reading of the 2010 response as a site prohibition, the argument about what label rules can reach, the connection to our hantavirus article and the suggested guidance are ours rather than sourced positions.

30. Conclusion

Aluminium phosphide is stable in its container and releases phosphine gas once moisture from the air, water or acids reaches it, and phosphine is highly toxic to insects, burrowing pests, humans and every other animal.³ It is used to protect stored grain and, in limited settings, to treat burrowing vertebrates, and it is restricted accordingly: the highest toxicity category for inhalation in one country and sold only to certificate or licence holders in Canada.⁶¹¹ In February 2010 two small children in Utah died after a licensed applicator treated rodent burrows on the family's lawn and the gas entered the house, and the state found the application careless or negligent.²⁵ Within two months the national regulator prohibited all residential uses, raised the buffer around occupied non-residential buildings from 15 to 100 feet and required a written plan before every application.¹ Current labels state the prohibition in capital letters.³

The two incidents that followed were not reachable by any of that. In Fort McMurray in 2015, tablets brought illegally from Pakistan were placed around an apartment to kill bed bugs, a vacuum lifted the material into the air, and an infant and her two-year-old brother died.⁹¹⁰¹² In Amarillo in 2017, pellets obtained from a friend by an uncertified father were spread under a mobile home to kill mice, and when the family complained of the smell he hosed them with water, and four children died.⁷⁶ A label governs the people who buy the product through the channel it was written for, and in both later cases the product had left that channel before anybody opened it.

What connects the two later deaths is the ordinary response to an unfamiliar spill. Water is the safe way to clean rodent droppings, as our hantavirus article found, and it was the lethal way to clean these pellets; a vacuum is the wrong way to handle both. No single cleaning instruction is safe for a material nobody has identified. The control that matters for a product like this is who can obtain it, and that control leaks through travel and through personal supply. This company performs fumigation and sits inside the professional channel. The one case in this article that involved a licensed applicator is the one whose lesson is ours to keep.

References

1. Article on the American regulator's new restrictions on phosphine fumigants, published by a pesticide reform advocacy organisation in April 2010. Advocacy material, flagged because the account of the regulatory change comes from a campaigning source. Source for the statement that the new restrictions prohibit all uses of aluminium and magnesium phosphide products around residential areas and increase buffer zones for treatment around non-residential buildings that could be occupied by people or animals from 15 feet to 100 feet; for the requirement that fumigant management plans be written before all applications of phosphine products, including burrowing pest fumigations; and for the reference to a 1998 reregistration decision and the investigation of the Utah deaths. https://beyondpesticides.org/dailynewsblog/2010/04/epa-sets-new-restrictions-on-phosphine-fumigants-to-reduce-poisonings/
2. News item on the Utah deaths and the resulting restrictions, published by a pest control trade magazine in 2010. Trade news material. Source for the account that two children aged four and fifteen months died in February 2010 after inhaling a phosphine fumigant used to treat a rodent burrow on a residential property, after an applicator treated the family's lawn; for the statement that investigators believed gas from the pellets seeped into the home; for the medical examiner's finding of elevated phosphorus and lung damage consistent with inhaling a harmful substance; and for the national regulator's announcement of new restrictions in April 2010. https://www.pctonline.com/article/pct1005-news/
3. Product label for an aluminium phosphide fumigant, in pellet form, accepted by the American regulator in 2019. Primary regulatory document. Source for the statements that the product is used to protect stored commodities from insects and, in limited areas, to control burrowing vertebrate pests; that use is strictly prohibited within 100 feet of any building where humans or domestic animals do or may reside on single and multi-family residential properties and at nursing homes, schools except athletic fields, day care facilities and hospitals; that aluminium phosphide fumigants are acted on by atmospheric moisture to produce phosphine gas; that phosphine is highly toxic to insects, burrowing pests, humans and other animal life; and that the gas may ignite spontaneously above its lower flammable limit of 1.8 per cent by volume. https://www3.epa.gov/pesticides/chem_search/ppls/001015-00074-20190410.pdf
4. Enforcement letter to county agricultural commissioners on aluminium and magnesium phosphide rodenticides, issued by a state pesticide regulator in April 2011. Official state government material. Source for the statement that in April 2010 the national regulator announced expanded use restrictions for rodenticide uses of these products in response to two deaths in Utah and directed all registrants to amend their labelling; and for the state's answer that the labelling strictly prohibits use on any residential property, even where the property produces commodities or livestock for the household's own consumption. https://www.cdpr.ca.gov/cac-letter/update-aluminum-and-magnesium-phosphide-rodenticides-new-approved-labeling-amendments-and-questions-and-answers
5. Archive page on aluminium phosphide published by the same pesticide reform advocacy organisation. Advocacy material. Source for the report that state investigators determined the Utah applicator had operated in a faulty, careless or negligent manner in misapplying a highly toxic restricted use pesticide, with the state agency able only to file civil penalties; and for the statements that aluminium phosphide is a restricted use pesticide for certified applicators and those under their supervision and that use within 100 feet of residential structures is a violation. https://beyondpesticides.org/dailynewsblog/category/chemicals/aluminum-phosphide/
6. National news report on the deaths of four children in Amarillo, Texas, published in January 2017. News material. Source for the account that four children aged seven to seventeen died after someone at their home used water on previously applied aluminium phosphide, producing phosphine gas; that ten people were inside the mobile home and at least five others were hospitalised; that the incident was preliminarily ruled an accidental poisoning; and for the statement that the national regulator lists aluminium phosphide in Toxicity Category I, the most toxic category, citing acute effects by inhalation. https://www.cnn.com/2017/01/02/us/amarillo-texas-pesticide-deaths
7. National broadcaster's report on the criminal investigation into the Amarillo deaths, published in January 2017. News material. Source for the father's statement to responders that he spread the pellets under the home after obtaining the product from a friend; for a fire captain's statements that the product is not available for sale to the general public and that the father held no professional certification as far as he knew; for the account that responders initially thought the incident was carbon monoxide poisoning; for the determination that phosphine was likely released when the father used a garden hose to rinse away pellets because family members had complained of the smell; and for the statement that a resident had been trying to kill mice. https://www.cbsnews.com/amp/news/gas-poisoning-amarillo-texas-criminal-investigation-poisoning-killed-4-kids
8. Syndicated national news report on the Amarillo deaths, published by a local broadcaster in January 2017. News material. Cited only for its statement that an eight-month-old Canadian girl had died the previous year after her mother used phosphine tablets in their home, which this article compares with Canadian reporting dating the death to February 2015. https://www.nbc26.com/news/national/4-children-die-from-pesticide-toxic-gas-under-home
9. National public broadcaster's report on the Fort McMurray death, published in February 2015. News material. Source for the account that an eight-month-old girl died after exposure to phosphine used to kill bed bugs in an apartment, with four siblings hospitalised, two of them in critical condition in Edmonton; for a family member's statement that the insecticide was brought into Canada illegally from Pakistan to fight a bed bug infestation; and for the description of phosphine as a colourless gas that would have accumulated in the apartment over a number of days. https://www.cbc.ca/news/canada/edmonton/phosphine-pesticide-used-to-kill-bedbugs-causes-fort-mcmurray-baby-s-death-1.2969189
10. National public broadcaster's report on the death of a second child in the Fort McMurray case, published in February 2015. News material. Source for the account that a two-year-old boy died days after his sister; for the report that firefighters found an unmarked container of phosphine in the home; and for the statements that in Canada phosphine is used in grain storage and must be administered by trained users, while outside Canada it has been approved for use in other contexts. https://www.cbc.ca/news/canada/edmonton/phosphine-poisoning-2nd-child-dies-in-edmonton-hospital-1.2974258
11. Canadian Press report on the Fort McMurray case, reproduced by a regional newspaper in February 2015. News material. Source for the statement that the insecticide is only supposed to be used in the province by pest control companies and licensed farmers; for a university toxicologist's statements that there is no antidote and that exposure can cause long-term damage to the liver, heart and kidneys; for a deputy fire chief's statement that phosphine is a heavy gas that would have affected children playing on the floor more than adults; for the provincial listing of aluminium phosphide as a Schedule 1 substance; and for Health Canada's statements that imported pesticides must be regulated under the Pest Control Products Act and bear a Canadian label, and that such pesticides are restricted and can only be sold to holders of an appropriate certificate or licence. https://www.kelownadailycourier.ca/news/national_news/article_4063e4f9-cab1-581a-afa6-c4ec12c46e3b.html
12. National broadcaster's report on the funeral in the Fort McMurray case, published in February 2015. News material. Source for a deputy fire chief's account that green tablets were placed around the apartment, particularly in one bedroom, to kill bed bugs, and that when the mother vacuumed the floor some of the toxic material was disturbed, broke down and became airborne before the children became sick. https://globalnews.ca/news/1852133/funeral-today-for-baby-killed-in-accidental-fort-mac-poisoning
13. Report on the Amarillo investigation, published by a regional newspaper in January 2017 and reproducing wire service reporting. News material. Cited for the statement that the water started the chemical reaction that released the phosphine gas, and for the account that a visitor arrived early in the morning, found everyone sick and called emergency services. https://news-journal.com/2017/01/03/police-investigate-accidental-poisoning-that-killed-4-children/
14. Online news report on the Fort McMurray case, published in February 2015. News material of uncertain editorial standard. Cited only for a community leader's statement to reporters that had the tablets become wet in hand luggage on the flight, the consequences for other passengers could have been grave. https://www.hngn.com/articles/72709/20150226/infant-dies-mothers-illegally-imported-bed-bug-pesticide-treatment-four.htm
15. Summary of recent Canadian fatalities linked to phosphine used as a bed bug treatment, published by a national collaborating centre for environmental health in March 2015 and read as an extract of its reference list. Canadian public health material. Cited for its existence as a Canadian public health response to the Fort McMurray deaths and for its reference to Health Canada's 2010 re-evaluation note on aluminium and magnesium phosphide, whose content we did not read. https://ncceh.ca/sites/default/files/Phosphine_Poisoning_Bed_Bug_Treatment_March_2015.pdf
16. Product label for an aluminium phosphide pellet fumigant sold under the name reported in the Amarillo case, accepted by the American regulator in August 2012. Primary regulatory document. Source for the statement that the product is for use against insects infesting stored commodities and for control of burrowing pests; for the 100-foot prohibition for burrowing rodent applications near residential buildings; for the Spanish-language instruction that a user who cannot read English should not use the product until the label has been fully explained; for the warning that non-target organisms exposed to phosphine in burrows will be killed; and for the warnings that pellets and partially spent dust release phosphine on contact with moisture, water, acids and many other liquids, that piling of tablets may raise temperature and confine gas so that ignition could occur, and that containers should be opened in open air or near a fan exhausting outdoors. https://www3.epa.gov/pesticides/chem_search/ppls/00020D98.pdf
17. National broadcaster's report on the Amarillo investigation, published in January 2017. News material. Source for the name of the pellets involved; for the statement that the product is only supposed to be sold to people with professional licences or certification, with authorities looking into why the family had it; and for the report that the children's mother was in critical condition. https://www.cbsnews.com/news/gas-poisoning-amarillo-texas-criminal-investigation-poisoning-killed-4-kids/