A former lab director at New York City’s Office of the Chief Medical Examiner said in a federal lawsuit filed Thursday she was fired because she raised questions about practices at the city facility before a New York State oversight commission.

Marina Stajic, head of the office’s Forensic Toxicology Lab for 29 years and a member of the State Commission on Forensic Science, said she was forced out because she raised questions about a conflict of interest and the use of unreliable DNA practices in the city lab.

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The federal court lawsuit filed in Manhattan also alleges top city lawyer Zachary Carter intervened with the state commission to block release of a transcript of its discussion of conflicts of interest in hiring a new head of the city’s biological lab, and that Stajic’s age, 66, was a factor in her April, 2015, firing.

Nick Paolucci, a spokesman for Carter, said, “The Law Department will review the claims. We haven’t seen the suit.”