However, he chose to ignore the advice and put down rat poison himself.

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Zegerman found an unopened box of rat poison near the potted phlox beside her welcome mat, and the tension escalated from there.

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Biocides are the name given for pesticides used outside the field of agriculture, such as rat poison or treating furniture with fungicides.

BBC: MEPs warning over rat population increase

It prevented strokes at least as well as warfarin, the 60-year-old drug derived from rat poison, and, if anything, caused less serious bleeding.

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There was particular concern over plans to put Difenacoum - used in rat poison - on the list of products that are more stringently regulated.

BBC: MEPs warning over rat population increase

Once incorporated into rat poison, its use is highly restricted.

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For 60 years, doctors have had only one pill to prevent clotting: warfarin, a drug originally derived from rat poison and sold under the brand name Coumadin by Bristol-Myers Squibb (nyse: BMY - news - people ).

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The substance was flown to a Berlin hospital for tests that confirmed it was rat or mouse poison.

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She said that while there was no evidence foul play was involved, certain symptoms were consistent with dogs who ingest rat or mouse poison.

WSJ: Owner: Dog may have been poisoned at Westminster