My Dad was involved in the first conviction of a woman using Thallium, a common rat poison, to poison her husband. There was a whole series of Thallium poisonings in the 1950s,which was made into an ABC documentary Recipe for Murder. Dad's involvement was never included in the documentary so he gets his chance to put some of the record straight. This is from my short story which won the Thunderbolt Prize for non-fiction crime stories