According to the arrest warrant, the 18-year-old Mosley was driving on Interstate 40 in Knox County on Wednesday at 1:51 a.m. when he was stopped for driving 79 mph in a 55-mph zone. The arrest warrant also states Mosley "performed poorly" in a field sobriety test and that a search of his vehicle revealed marijuana residue.
The Knoxville News-Sentinel earlier reported Mosley's arrest.
Tennessee athletic department spokesman Jason Yellin said the school was aware of the situation and is "in the process of gathering all of the facts and information."
After missing the entire 2014 season with a broken tibia, Mosley worked out on both sides of the line during spring practice.