A Ventura man is in custody on multiple charges after police say he was found with fentanyl, methamphetamine, and a loaded firearm during a traffic stop, authorities said Friday.

Brian Mohler was contacted by an officer conducting proactive patrols for outstanding warrants out of Los Angeles. The officer detained and arrested Mohler near North Bank and Topaz while he was in his vehicle.

According to the Ventura Police Department, Mohler, a convicted felon, had fentanyl and methamphetamine for the purpose of sale. He was also unlawfully in possession of a concealed, loaded pistol. 

Mohler faces charges of being a felon in possession of a firearm and ammunition, possession of a loaded firearm while in possession of narcotics, and transportation and possession of fentanyl and methamphetamine for sale.

Following the arrest, detectives obtained and executed a search warrant on a storage unit linked to Mohler, seizing a cache of illegal weapons and firearm parts.

Authorities say additional charges are expected, including possession of suppressors, possession of an unregistered assault rifle, possession of a machine gun equipped with a “Glock Switch,” and additional counts of felon in possession of a firearm, as California law allows each firearm to be charged separately.