How a simple cup of tea became a serial killer’s deadly weapon

‘Guilty,’ proclaimed a jury at St Alban’s Crown Court in Hertfordshire on Thursday, June 29, 1972.

Over nine days, the men and women had heard in shocking detail how Graham Young murdered two colleagues and attempted to kill others with lethal doses of poison.

But the jury had one more shock in store. Once proceedings were over [a jury is not allowed to know of previous convictions...