Police say he was in possession of marijuana.
Frederick Police have charged a Monrovia man with possession of marijuana. Ryan Mason, 20, was arrested Friday following a traffic stop.
Two plain clothes officers observed a traffic violation in the area of South East Street and Monocacy Boulevard. The vehicle was pulled over, and a police canine was called to the scene to sniff for drugs. The dog indicated the presence of narcotics. The front seat passenger told police that marijuana in the center console was his. The pot was recovered.
Mason was taken to Central Booking for processing.