Clemson still doesn't know how three players failed drug tests ahead of the Cotton Bowl in late December, according to The Post and Courier.
The program is continuing to appeal the suspensions of defensive tackle Dexter Lawrence, offensive lineman Zach Giella and tight end Brandon Galloway, who tested positive for the banned substance ostarine before Clemson's CFP semifinal game win over Notre Dame. The three Tigers players also missed Clemson's 44–16 national championship victory over Alabama.
Swinney told The Post and Courier that the school's lawyers are still searching for the cause of the positive tests, including looking at supplements that were approved by Clemson.