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The Boston Globe

Metro

State chemist accused of mixing drug samples

Prosecutor says drugs combined, weights faked

DEDHAM — Former state chemist Annie Dookhan mixed drugs from unrelated criminal cases to assure positive results and manipulated evidence to increase its weight, a prosecutor said Wednesday, providing the most extensive description yet of the alleged tampering at a Jamaica Plain laboratory.

Assistant Norfolk District Attorney Thomas Finigan said that in some cases handled at the lab, evidence that initially testing negative for the presence of illegal drugs was subjected to retesting and came back positive for contraband. In other cases, the weight of drug evidence was increased, thus potentially elevating the penalties that suspects faced.

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