UFC fighter Jon Jones' B sample reportedly tested positive for a banned substance.
Brett Okamoto of ESPN.com reported the news Tuesday, noting the B sample was for Jones' failed drug test from July 28.
This comes after Ariel Helwani of MMA Fighting reported on Sept. 1 Jones passed a blood test in the immediate aftermath of UFC 214 on July 29.
Helwani also noted Jones passed tests on July 6 and July 7, although his July 28 urine test came back positive.
Shaun Al-Shatti of MMA Fighting noted this is not the first issue for Jones, who was stripped of his previous title following a hit-and-run accident and lost the UFC interim light heavyweight title when he tested positive for two banned substances before a scheduled fight against Cormier.