A Massachusetts chemist whose alleged mishandling of drug samples has thrown thousands of criminal cases into question testified under oath that she holds a master's degree in chemistry from the University of Massachusetts, but school officials say they have no record of her receiving an advanced degree or taking graduate courses there. Annie Dookhan also listed a master's degree from UMass-Boston on a 2011 resume. But officials at UMass-Boston and each of the university's four other campuses say there is no record of Dookhan receiving a master's degree from UMass.

Last month, state police shut down the Boston lab Dookhan worked at, saying she failed to follow testing protocols and deliberately mishandled drug samples submitted by police departments in criminal cases. Dookhan did not return calls to her home Monday and Tuesday. (Associated Press)