Young Thug's Co-Defendant Hands Him Drugs in Court, Both Busted Immediately

Young Thug and one of his YSL co-defendants are accused of pulling off a hand-to-hand drug deal while in court, during jury selection for Thug's RICO trial ... and it's all on camera.

Courtroom surveillance footage captured the moment Wednesday in Fulton County Court ... Kahlieff Adams walks over to Thug and clearly hands him an object. Aside from the cameras, at least 2 bailiffs were just a couple feet away, saw the whole transaction, and immediately nabbed Adams.

According to docs, obtained by TMZ Hip Hop, a deputy later discovered the object was a baggie of Percocet pills. While Adams is a defendant in the YSL RICO case, he is already serving a life-without-parole sentence for murder.

Thug's lawyer Keith Adams, no relation, denies his client had anything to do with the drug deal, as the state claims in docs. He says Thug complied after being instructed to hand over the pills to the deputy,

BTW, when deputies searched Kahlieff they say he had more percs, marijuana, tobacco and other contraband wrapped in plastic and food seasonings to mask the scent of the weed. He was taken to a nearby hospital, because authorities suspected he swallowed other drugs in an attempt to conceal them.

Both Thug and Adams are being blamed for delaying court … not the best impression for Judge Ural Glanville, who's had his hands full with the case before it even got off the ground.