In October 1982 seven people in the US died after taking, Tylenol, a painkiller which had been deliberately contaminated with cyanide. Claire Bowes has been speaking to David E Collins, the drug company executive who dealt with the aftermath of the tragedy.

(Photo: Mrs. Helen Tarasiewicz, mother of Tylenol cyanide victim Theresa Tarasiewicz Janus, weeps over the casket containing her daughter"s body during graveside services at Maryhill Cemetery in Chicago Tuesday, 6 Oct 1982. Theresa, her husband Stanley Janus and Stanley"s brother Adam Janus all poisoned by cyanide from the same Tylenol bottle. Credit: Charles Knoblock/AP Photo)