A routine traffic stop turned into a drug bust Monday night in Sonora when police searched a car containing four ounces of uncut crystal methamphetamine. About 11:25 p.m., Sonora police pulled over a 2006 Pontiac G-6 on Snell Street for speeding and crossing a double yellow line. While talking with driver Silvestere Lizarraga, 18, of Riverbank and passenger Gerardo Ballardo, 18, of Riverbank, officers smelled marijuana. A subsequent search turned up the meth, which has an estimated street value of $7,000 to $8,000, police said. Lizarraga and Ballardo were arrested and booked at the Tuolumne County Jail on two felony counts of possession of a controlled substance and one felony count of transporting a controlled substance.