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The Boston Globe

Metro

How a chemist circumvented her lab’s safeguards

Close supervision is key in a lab, specialists say, and Annie Dookhan’s appeared to lack it

State drug lab chemist Annie Dookhan labeled the vials as containing THC, the active ingredient in marijuana. But when another chemist ran the vials through a machine to confirm Dookhan’s analysis, one had little THC, and another was mixed with morphine and codeine.

The second chemist sent the vials back to Dookhan to resolve the discrepancies, asking her to repeat the screening test the lab used to tentatively identify the drugs in an evidence bag. When she resubmitted them, the machine showed the vials contained pure THC.

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