BOSTON — A former drug lab chemist convicted of faking test results and tampering with evidence, leading to a review of tens of thousands of criminal cases, is out of prison.

Annie Doohkan has been paroled, a spokesman for the Massachusetts prisons system confirmed to the Boston Herald. Nicolas Gordon, the attorney who represented Dookhan during her criminal case, said she was released about a month ago.

Dookhan tampered with evidence while working as a testing chemist at a Boston lab operated by the Department of Public Health.

She was sentenced to three to five years in prison in November 2013.

Gordon says Dookhan’s focus has been on her family and she hasn’t made any major decisions about her future.

But while Dookhan is now free, thousands of people are still in prison awaiting a chance to challenge convictions made on possibly tainted evidence, the Massachusetts chapter of the American Civil Liberties Union said Tuesday in response to the news.

The civil rights group has sued to have local district attorneys turn over lists of possibly impacted cases by May 9. Prosecutors have previously estimated that there could be 20,000 such cases.