More than 300 convicted inmates have been released from Massachusetts state prisons in the US as a result of the September 2012 arrest and subsequent indictment of Annie Dookhan, who worked in a Department of Public Health state laboratory and allegedly falsified evidence used in criminal cases. Now the scandal has grown with the prosecution of another Massachusetts state lab chemist for tampering with evidence and stealing drugs seized as evidence. Sonja Farak, who worked at the Massachusetts State Crime Laboratory in Amherst, was charged with tampering with four drug samples stored at the lab on 1 April. In two...