THE NEWS SAYS: An effort to weed out bad cops? Prove it.

Police Commissioner Jimmy O’Neill is promising to crack down on dishonest cops. We don’t doubt his sincerity, but we’ll believe it when we see it — with names and details attached. Days after Det. Michael Foder was indicted in a federal Brooklyn court for faking lineup results, O’Neill penned an Op-Ed in Sunday’s Daily News pledging reform.

His unequivocal declaration — that “a police officer who intentionally lies under oath has no place in law enforcement” — took on more resonance after a report Monday in BuzzFeed News.

The story alleges, based on an extensive analysis of internal documents, that more than 300 cops who committed fireable offenses between 2011 and 2015 remain on the force, barely disciplined.

Their infractions are serious: In addition to lying under oath, they include assault, excessive force, ticket-fixing and firing a gun without cause.

The details are almost always unknown and unknowable due to an opaque process designed to keep disciplinary actions out of public view.

It should go without saying that even if the 300 number is right, it represents a sliver of the 36,000-strong force, which engaged in 9 million radio runs and testified in more than 1 million criminal cases each year. Most cops are honest.

The problem O’Neill faces is that he’ll never be able to prove he’s rooting out bad cops as long as he claims to be handcuffed by a state civil rights law that blocks the public sharing of personnel records of uniformed employees.

Over the last two years, the city law department and the NYPD have outrageously opted to interpret that law, 50-a, in the narrowest of terms, keeping even basic disciplinary information in a black box. Courts have sided with their reading.

Given these insane constraints, how exactly does O’Neill intend to show the public which cops have been sanctioned and fired for perjury?

“Trust me” won’t cut it. Show us, commissioner.