(KRON) -- A Stockton couple was arrested last week by San Jose police in connection to a narcotics investigation that uncovered over a dozen illegal firearms along with thousands of dollars’ worth of designer clothing and accessories, according to the San Jose Police Department. Police in San Jose began the investigation after intercepting a fentanyl sale within the city on Dec. 3, 2024. The suspect, identified as 37-year-old Justin Dixon, routinely traveled from his residence in Stockton to sell narcotics in San Jose and San Francisco, according to SJPD’s Street Crimes Unit. Tesla driver arrested for randomly threatening, pepper-spraying man in San Mateo Investigators said Dixon’s girlfriend, Jade Linhthasack, 26, of Stockton, was involved in purchasing firearms and providing them to Dixon, who is prohibited from owning them. On Thursday, Dixon and Linhthasack were arrested in Stockton after police served arrest and search warrants with assistance from the Stockton Police Department SWAT Team, Covert Operations Unit and the Gang Violence Suppression Unit. SJPD said the search warrant for Dixon’s residence uncovered: 13 illegal firearms, including an assault rifle, a semi-automatic pistol and a rifle with illegal modifications Approximately 5,000 rounds of various ammunition Various firearm parts and magazines “Large quantities” of illegal narcotics, including cocaine, oxycodone, promethazine, cannabis and other illegal prescription medications Thousands of dollars' worth of designer brand watches, purses, shoes, clothing and accessories Gold and diamonds (San Jose Police Department) Of the 13 recovered firearms, authorities said two were stolen, two had destroyed serial numbers and two were unregistered. The designer items were “believed to be purchased with the money obtained from illegal firearm and narcotics sales,” according to SJPD. Dixon was booked into San Joaquin County Main Jail for possession of illegal firearms and narcotics sales. Linhthasack was booked into San Joaquin County Main Jail for charges in connection to the illegal firearms.