Annie Dookhan (center) sits between two unidentified men in Suffolk Superior Court in Boston moments before her arraignment on Thursday, Dec. 20, 2012. Ms. Dookhan, the former chemist at the center of a drug-testing scandal, pleaded not guilty to charges including perjury and tampering with evidence. (AP Photo/Steven Senne, Pool)

Photo by: Steven Senne

Annie Dookhan (center) sits between two unidentified men in Suffolk Superior Court in Boston moments before her arraignment on Thursday, Dec. 20, 2012. Ms. Dookhan, the former chemist at the center of a drug-testing scandal, pleaded not guilty to charges including perjury and tampering with evidence. (AP Photo/Steven Senne, Pool)