(KRON) – A passenger was arrested Friday night in Marin County for weapons-related charges.

Around 10:30 p.m. a deputy conducted a traffic stop after noticing a vehicle had heavily tinted windows. The driver was found to be on parole.

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The deputy searched the vehicle, given the driver’s parole status, and found the back passenger to be in possession of a loaded, unregistered 10mm semiautomatic pistol, according to Marin County Sheriff’s Office.

The back passenger was arrested and booked at Marin County Jail.