Ravinder Kaur, 34, was charged with administering a poisonous or noxious substance and stood trial for three weeks at Blackfriars Crown Court.

BBC: 'Mercury coffee' case accused to face retrial

She denies administering a poisonous or noxious substance with intent.

BBC: Dental nurse 'poisoned boss's coffee with mercury'

It is genetically engineered to produce a particular strain of Bt, a substance that is poisonous to some insects.

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