Mauldin was riding his moped down Floyd Street on campus when a car struck him. The car then sped off.
The 6-foot-4, 250-pound Mauldin was transported to Jewish Hospital where U of L spokesman Rocco Gasparro said he was "alert and responsive." Gasparro said in a release that more tests were being run.
The school sent out an update around 1 p.m. saying all tests had come back positive, He will be kept overnight for precautionary measures.
A junior from Atlanta, Mauldin has 22 tackles and 4.5 sacks in 11 games last season for the Cardinals. He's expected to be one of the top defensive players for the No. 9 Cardinals this season.
U of L opens the season on Sunday against Ohio University at 3:30 p.m.
Cardinal Authority will update this story as more details become available.