Prosecutors are asking a New York City court to throw out 90 drug convictions following a review of arrests involving a former narcotics detective charged with corruption.

The mostly low-level cases investigated by Joseph Franco while a NYPD officer in Brooklyn from 2004 to 2011 should be vacated because of his ongoing criminal case in Manhattan, Brooklyn District Attorney Eric Gonzalez said Wednesday. A 2019 indictment accuses Franco of perjury and other charges alleging he framed innocent people.

The review of the mostly low-level Brooklyn cases dating back a decade or more found no similar misconduct on Franco’s part or that the defendants were innocent, prosecutors said Wednesday. But because of the Manhattan case, “I have lost confidence in his work,” Gonzalez said in a statement.

“I cannot in good faith stand by convictions that principally relied on his testimony,” he added.

Tina Luongo, attorney-in-charge of the Legal Aid Society’s criminal defense practice, lauded Gonzalez’s decision to vacate the convictions. She urged other district attorneys in the city to perform similar reviews.

Franco “touched thousands of cases throughout New York City, and we may never know the full extent of the damage he caused and lives he upended,” Luongo said in a statement.

During a virtual hearing on Wednesday morning, a judge began the process of vacating the cases at the request of defense attorneys. At issue were 27 felony and 63 misdemeanor convictions, most resulting from guilty pleas.