USC quarterback Mark Sanchez was arrested for allegedly sexually assaulting a woman. L.A.P.D. Officer Jason Lee says Sanchez was taken into custody around 4 p.m. Wednesday. He's accused of sexually assaulting a female student. Sanchez is listed on the Trojans' depth chart as the backup to John David Booty, but is expected to battle for the starting job this fall. Booty practiced only once this spring before he injured his back and had to undergo surgery. Sanchez played the recent spring scrimmage and has been practicing with the first unit. He will be a redshirt freshman this coming season.