Allonzo Trier will play for Arizona against UCLA on Saturday.
Trier, a 6-foot-5 guard, has missed the first 19 games of the Wildcats' season after testing positive for a PED.
"The NCAA notified us on Friday afternoon that Allonzo Trier's most recent drug test was negative," the university said in a statement. "Therefore, he is eligible to return to the court immediately and will be available for our game against UCLA."
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Heading into the season, Trier was regarded as Arizona's best scorer. Trier averaged 14.8 points and 3.3 rebounds per game for Arizona last season.
The Wildcats are currently 17-2.