Former Detective Stephen Anderson, seen here in 2009, is testifying under a cooperation agreement with prosecutors.

A former NYPD narcotics detective snared in a corruption scandal testified it was common practice to fabricate drug charges against innocent people to meet arrest quotas.

The bombshell testimony from Stephen Anderson is the first public account of the twisted culture behind the false arrests in the Brooklyn South and Queens narc squads, which led to the arrests of eight cops and a massive shakeup.

Anderson, testifying under a cooperation agreement with prosecutors, was busted for planting cocaine, a practice known as “flaking,” on four men in a Queens bar in 2008 to help out fellow cop Henry Tavarez, whose buy-and-bust activity had been low.

“Tavarez was … was worried about getting sent back [to patrol] and, you know, the supervisors getting on his case,” he recounted at the corruption trial of Brooklyn South narcotics Detective Jason Arbeeny.

“I had decided to give him [Tavarez] the drugs to help him out so that he could say he had a buy,” Anderson testified last week in Brooklyn Supreme Court.

He made clear he wasn’t about to pass off the two legit arrests he had made in the bar to Tavarez.

“As a detective, you still have a number to reach while you are in the narcotics division,” he said.

NYPD officials did not respond to a request for comment.

Anderson worked in the Queens and Brooklyn South narcotics squads and was called to the stand at Arbeeny’s bench trial to show the illegal conduct wasn’t limited to a single squad.

“Did you observe with some frequency this … practice which is taking someone who was seemingly not guilty of a crime and laying the drugs on them?” Justice Gustin Reichbach asked Anderson.

“Yes, multiple times,” he replied.

The judge pressed Anderson on whether he ever gave a thought to the damage he was inflicting on the innocent.

“It was something I was seeing a lot of, whether it was from supervisors or undercovers and even investigators,” he said.

“It’s almost like you have no emotion with it, that they attach the bodies to it, they’re going to be out of jail tomorrow anyway; nothing is going to happen to them anyway.”

The city paid $300,000 to settle a false arrest suit by Jose Colon and his brother Maximo, who were falsely arrested by Anderson and Tavarez. A surveillance tape inside the bar showed they had been framed.

A federal judge presiding over the suit said the NYPD’s plagued by “widespread falsification” by arresting officers.