Agnello, 16, was found with marijuana, OxyContin and morphine pills when authorities pulled him over on a Long Island road for failing to heed a stop sign, Suffolk County police Lt. Donato Mignone said Monday.
The teen, who was driving a rented sport utility vehicle, was charged with two counts of criminal possession of a controlled substance, police said. He could face up to a year in prison if convicted.
Agnello's attorney, Adam Mandelbaum, said no drugs were found on Agnello during the Nov. 10 arrest in Dix Hills. "The rest of the matter is under investigation," Mandelbaum said.
He said Agnello will plead not guilty at a Jan. 24 hearing in Central Islip.
Mignone said police discovered the OxyContin and morphine pills in the SUV's glove compartment, console and trunk. He said two passengers were also charged.
Agnello was also given a summons for driving without a license, police said.
The teen is the son of Victoria Gotti, daughter of legendary mob boss John Gotti and sister of John "Junior" Gotti. Besides starring in "Growing Up Gotti" with his mother and brothers, Carmine and John, Agnello has written a book, "The Gotti Diet."
John Gotti was convicted of racketeering and murder in 1992. He died 10 years later in a federal prison.