A youth counselor at a juvenile detention facility in Brooklyn pocketed more than $70,000 in bribes to sneak in drugs and weapons, Big Apple investigators said Thursday.

Lymek Frazier, 31, is accused of taking payments from relatives and friends of youths locked up at the Crossroads Juvenile Center through cash apps, including over $21,000 in bribes in 48 “transactions” over just six months last year, the New York City Department of Investigation announced.

“This defendant was trusted to ensure the safety and well-being of the young people under his supervision as a youth development specialist,” DOI Commissioner Jocelyn Strauber said.

“He betrayed that trust when, as charged, he accepted illicit payments to smuggle contraband into the Crossroads Juvenile Center, jeopardizing the safety of its residents and staff,” she said.

Frazier was hired in November 2023 to work at Crossroads — one of two juvenile detention centers in the five boroughs — that houses about 175 criminal defendants between the ages of 14 and 20.

As with adult jails, the smuggling of cellphones, drugs and weapons into Crossroads has been a concern, and the site’s 280 staffers are required to go through security checks when they show up for work.

But at least 112 cell phones and nearly 700 blades were recovered inside the facility between March 2022 and last month — thanks to staffers like Frazier, according to investigators.

In total, the DOI said he accepted $72,356 to sneak in contraband, arranging payments to provide the troubled youths with drugs and tobacco — using code words like “1 zip,” “sprinkles” and “grabba.”

Investigators said Frazier’s luck ran out on Jan. 10, when he showed up for work and was going through security when a silver blade fell out of his pocket — costing him his $51,000-a-year job.

He was arraigned in Brooklyn federal court late Wednesday and was released on a $100,000 bond and ordered to remain in home detention with an ankle monitor, the DOI said.