Polk received a citation for trafficking a controlled substance within 1,000 feet of school following the Oct. 7 incident. The campus police report states that campus police entered his apartment and found marijuana, hydrocodone pills and codeine syrup.
Cardinals coach Bobby Petrino said in a statement confirming Polk's release ''that it is important that we provide him with the help and support needed to help him with his problems.'' University spokesman John Drees declined comment on Polk's status at the school.
The 6-foot-2, 188-pound Fishers, Indiana, native enrolled in January but missed part of spring practice with injuries. He is listed as having played this season but has no recorded statistics.