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    The state drug lab scandal: how it unfolded

    A chemist at Hinton State Laboratory Institute allegedly breached procedure and mishandled evidence involved in drug cases, prompting the laboratory to be shut down.
    Tamir Kalifa for The Boston Globe
    A chemist at Hinton State Laboratory Institute allegedly breached procedure and mishandled evidence involved in drug cases, prompting the laboratory to be shut down.

    David L Ryan/Globe Staff
    John Auerbach.

    THE DRUG LAB SCANDAL: How it unfolded

    August 30

    State Police shut down the Hinton State Laboratory Institute in Jamaica Plain after an investigation uncovers alleged widespread malfeasance by a former chemist, Annie Dookhan, who had tested thousands of drug samples in criminal cases since 2003.

    September 17

    John Auerbach, the commissioner of the state Department of Public Health, which had run the lab until shortly before its closure, resigns, saying, “It is clear that there was insufficient quality monitoring, reporting, and investigating.”

    Pat Greenhouse/Globe Staff
    Governor Deval Patrick.

    September 20

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    Governor Deval Patrick appoints veteran prosecutor David Meier to lead an investigation into tens of thousands of potentially tainted criminal cases.

    September 27

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    Robert Mulligan, chief justice of the state Trial Court, announces that special courts will be established around Massachusetts to handle affected criminal cases.

    John Tlumacki/Globe Staff
    Annie Dookham was arrested at her Franklin home by Mass. State Police.

    September 28

    Annie Dookhan is arrested by State Police at her Franklin home and charged with 2 counts of obstructing justice and one count of falsifying her academic record.

    November 5

    Patrick asks state Inspector General Glenn Cunha to lead the probe into what went wrong at the Jamaica Plain lab; Cunha takes over the inquiry from Attorney General Martha Coakley, whose office continues to pursue the criminal investigation into Dookhan.