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December 20, 2012
Steven Senne photo

Annie Dookhan, front left, stands during her arraignment at Suffolk Superior Court, in Boston, Thursday, Dec. 20, 2012. Dookhan, the former chemist at the center of a U.S. drug testing scandal, pleaded not guilty to charges including perjury and tampering with evidence.

Steven Senne photo

Annie Dookhan sits in Suffolk Superior Court moments before her arraignment in Boston, Thursday, Dec. 20, 2012. Dookhan, the former chemist at the center of a U.S. drug testing scandal, pleaded not guilty to charges including perjury and tampering with evidence.