Now that a new Muni study has exposed that almost 1 in 10 riders may be rudely riding the city's buses and streetcars for free - costing the cash-strapped agency an estimated $19 million a year in lost revenue - San Francisco Supervisor and mayoral wannabe Bevan Dufty has called for a City Hall hearing on the Police Department's bus check program.

Dufty also plans to focus on violent crime aboard Muni, which has captured public notice with several high-profile incidents, among them the beating of an 18-year-old actor, the stabbing of an 11-year-old boy and the argument between two women fighting over a seat on a bus that became a local YouTube hit.

The bus check program requires SFPD patrol officers to ride Muni at least two times a shift. Muni has a divide team of fare-inspection officers.

"News reports about continued violence on Muni and estimates that up to $19 million is lost every year due to fare avoidance, I look forward to hearing from the Police Department and Muni about the bus inspection program," Dufty said. He listed a hearing earlier than the City Operations and Neighborhood Services Committee at 10:30 a.m. on Nov. 9