District attorneys in 44 of New York’s 62 counties should review scores of closed criminal cases, a state watchdog advised Thursday, because a forensic scientist working for the state police routinely failed to perform mandatory tests on crime scene trace evidence like hair fibers and then fraudulently wrote up results.

A report released by Inspector General Joseph Fisch [pdf] found that not only was State Police forensic scientist Garry L. Veeder performing defective tests between 1993 and 2008, but that his supervisors either failed or were not scientifically qualified to review his work to discover the errors.