Nevada Athletic Commission
Following his championship win at Resurrection Fighting Alliance 15, Casey was re-signed by the Ultimate Fighting Championship. He faced Bubba Bush at UFC 175 on July 5, 2014. He won the fight via TKO early in the first round due to a punch that dropped his opponent and subsequent elbows on the ground. However, Casey later failed a post-fight drug test for drostanolone, a form of anabolic steroid. Later, he was suspended for a year and fined $5,600 by the Nevada Athletic Commission.