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 incident, detailed in a State Police report, illustrates one of the many ways Dookhan was able to circumvent safeguards intended to ensure drug evidence was properly handled by workers in a now-closed state drug-testing lab.
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