Piotr Hallmann tested positive for drostanolone following his split decision loss to Gleison Tibau in the co-main event of UFC Fight Night 51 on Sept. 13 in Brasilia, Brazil, but he wants to appeal the result.

Hallmann, who dropped to 2-2 under the UFC banner with the decision loss, claims he’s innocent, and blames the Brazilian MMA Athletic Commission (CABMMA) for the positive result.

"I'm very angry that something like this came up, especially the way they handled the whole testing in Brazil was far from being professional," Hallmann told Bloody Elbow. "It was clear that the procedure was unreliable and strange to say the least and this should be a big concern for fighters and the UFC."

"Right after my fight when I walked back to my dressing room a very loud person who couldn't identify himself was shooting: 'Doping! Doping!' and speaking in broken English," he continued. "My coaches tried to figure out what the man wanted and finally it was clear that I needed to be escorted to a room where I was being tested, so like always I complied and gave my blood.

"At that moment I was badly injured and was waiting for transportation to the hospital. All of a sudden one of the people that tested me at the event drove all the way to the hospital telling us that something went wrong with the testing but at that time I was in extreme pain as the medical team was treating my broken jaw.

"The man understood and saw that it wasn't the best moment to do a second test as I was being injected with some painkillers. So the man apologized for the mistake and just left. During that moment I didn't make anything out of this strange situation as I know I'm a clean fighter who always have been professional with my career and never used any steroids or banned substance for that matter."

If Hallmann blames the CABMMA post-fight testing process for his failed test, he might not have a case.

Cristiano Sampaio, the COO of the Brazilian MMA Athletic Commission (CABMMA), told MMAFighting.com that Hallmann failed his pre-fight urine test, not the post-fight blood test.

"Every athlete who competes under the regulation of any commission, in Brazil or in the United States, is aware that they will undergo a urine drug test. He underwent the same process in his previous fight in Brazil," Sampaio said.

"We test every fighter on the card when they arrive at the arena on fight day. After the fight, we randomly choose four fighters, or pick four fighters, to do post-fight blood tests. For this event, we picked the main and co-main event fighters to test for HGH and testosterone. In Piotr’s case, he tested positive (for drostanolone) in his pre-fight urine test."

According to Sampaio, urine and blood samples were tested at the UCLA Olympic Analytical Laboratory, the world's largest World Anti-Doping Agency (WADA)-accredited sports drug-testing facility, and conducted by a doping control officer (DOO) credentialed by WADA and Brazilian Agency of Doping Control (ABCD).

Hallmann’s urine sample was tested twice, and he failed both tests.

In his interview to Bloody Elbow, Hallmann claimed "that mistakes have been made by the (Brazilian) commission which they even admitted," but Sampaio doesn’t know what he’s talking about.

"He said we admitted to committing mistakes, but we never did that," Sampaio said. "I’m the person who contacts fighters and managers, and I never said that."

Hallmann plans to appeal the failed test, saying that his career is "in serious danger and my name has been tainted" and "the whole testing procedure is unreliable and this could be a serious matter for future events that will be held in Brazil."

"He has the right to appeal," Sampaio responded. "If he wants to appeal the result, I will send the request to the UCLA Olympic Lab and they will test the second urine sample. If he’s talking about our collecting procedures, I’ll ask ABCD to send him a report of the whole procedure. But if he’s questioning our integrity and responsibility as a regulation body in Brazil, we will have a response for him. I hope that’s not the case."