Friday 8 July 2016 22:46, UK
A doping test on Jon Jones' back-up sample has confirmed the positive results that forced the UFC to drop the pound-for-pound star from his main-event bout at UFC 200 this week.
USADA spokesman Ryan Madden confirmed an independent lab's findings on Jones' B sample on Friday.
Jones was removed from the UFC's landmark card on Wednesday night after the potential doping violation was first discovered in a sample taken June 16.
Jones and his management haven't revealed the substance for which Jones tested positive, but the fighter tearfully denied knowingly using any performance-enhancing drugs.
Jones could face a multiyear suspension from the Nevada Athletic Commission.
He was suspended by the UFC for several months in 2015 for his involvement in a hit-and-run accident, the latest in a series of behavioral missteps.
