Arizona Wildcats guard Allonzo Trier (35) stands in a huddle with his teammates before a game against Oregon State at Gill Coliseum in Corvallis, Oregon on Feb. 22, 2018. Trier was ruled ineligible to play after failing a drug test.
Ostarine is a selective androgen receptor modulator (SARM) used to treat osteoporosis and combat muscle wasting in the elderly. The World Anti-Doping Agency banned Ostarine in 2008 because, it said, the drug can produce effects similar to anabolic steroids. WADA reports an increase of positive tests for Ostarine in recent years; the organization says most athletes obtain the drug through black-market channels.

