The federal agent-led search of Juice WRLD’s private plane may have been the result of an ongoing investigation. According to TMZ, the late rapper had been on the FBI’s watchlist since an initial airport run-in last month.

While boarding a flight to Sydney, Australia from the LAX Los Angeles airport, Juice and his team were searched by drug-sniffing dogs and Customs Agents. The outlet reports that Juice was eventually allowed to board the plane, despite being suspected of carrying drugs.

Early Sunday morning (Dec. 8), Homeland Security agents, operating under an FBI task force, searched Juice’s private plane when it landed at Chicago’s Midway Airport. According to The Chicago Tribune, authorities confiscated 70 pounds of marijuana, six bottles of prescription codeine cough syrup, two 9 mm pistols, a .40-caliber pistol, a high-capacity ammunition magazine and bullets.

Federal agents and Chicago Police Department officers had been awaiting Juice’s arrival because they suspected the 21-year-old had drugs on the plane. According to TMZ, the plane’s pilot had also reported that Juice’s bodyguards were carrying handguns, which they were subsequently arrested for possessing. They have since been released, due to having valid conceal and carry permits.

The Chicago Police Department is currently running an investigation over the seized marijuana. No drug possession charges have been made.

Juice began seizing while agents searched the plane. The Chicago Tribune further reported that he was administered Narcan and temporarily regained consciousness, before passing away at the Advocate Christ Medical Center. Police asked his girlfriend if he had any seizure-causing medical conditions or had taken any drugs. She disclosed that while Juice didn’t have any medical problems, he did have a Percocet addiction.

Sources told TMZ that while the plane search was going on, Juice was seen swallowing several Percocet pills, possibly in an attempt to hide them from authorities.