As many as 100,000 children under 18 are being trafficked for sex in cities and towns around the U.S. according to statistics from the Justice Department, while another 200,000 are considered vulnerable because of their life style and environment. Most of the victims are girls, but 10-15% are boys. Oakland, San Francisco and Sacramento have been identified as hotspots for trafficking because of transportation links and attractions like casinos, conventions and sports events. Tom Herriman reports on some of the difficulties facing law enforcement efforts to stop child sex trafficking.