Tennessee running back LaMarcus Coker, the team's leading rusher last season, has been suspended indefinitely for violating the school's substance abuse policy, a source told ESPN's Joe Schad. Coach Phillip Fulmer did not specify what Coker had done when he announced the penalty Tuesday. "He must fulfill some obligations to the program and to me before he can return," Fulmer read from a prepared statement after practice. "I have tried, as has the administration, to work with him, but at this time he must help himself."