But in a random drug test given to him on Dec. 4 by the Nevada Athletic Commission, Jones tested positive for benzoylecgonine, the main metabolite in cocaine.

The Nevada commission follows the World Anti-Doping Agency code and benzoylecgonine is not banned out-of-competition. As a result, the commission was unable to penalize Jones or prevent him from fighting despite knowing of the positive test.

It conducted a follow-up test later in December that Jones passed. Yahoo Sports was unable to get the exact date of the second test that Jones passed.

Jones released a statement to Yahoo Sports through his attorney acknowledging his problem. 

Nevada commission chairman Francisco Aguilar said the commission is going to discuss out-of-competition drug tests at its next meeting and whether to break from the WADA code in similar situations. 

"I am pleased that Mr. Jones is addressing this issue and seeking help for his problem," Aguilar said.

The test given to Jones was analyzed for anabolic agents, peptide hormones, growth factors and related substances, beta-2 agonists, hormone and metabolic modulators, diuretics and other masking agents, stimulants, narcotics, canabinoids and glucocorticosteroids.