Yesterday Keith Keizer from the Nevada State Athletic Commission revealed that after extensive testing they believed that UFC light-heavyweight star Thiago Silva had provided a “non-human” urine sample during a drugs test prior to UFC 125 on January 1st.

After previously denying any wrong-doing, Silva today confessed that the allegations were indeed true.

“We make decisions every day of our lives. Some are good and some are bad,” Silva said in a statement released earlier. “When you make a bad decision, you can either make the situation worse by trying to cover it up or lie about it or just stick your head in the sand and refuse to acknowledge it even happened or you can own up to it with an honest explanation, accept the consequences of your actions, apologize to the people affected by it, learn from it and move on. I’m choosing the second option.

“I used a urine adulterant when giving a sample following my fight with Brandon Vera. I did so in an attempt to alter the results of the test and knowingly broke the rules of the Nevada Athletic Commission. This was a terrible decision on my part for which I will be punished. I am prepared to accept this punishment, learn from it and move on. I apologize to the Commission, the UFC, Brandon Vera and the MMA fans.”

Beyond the apology Silva also offered up an explanation as to why.

“I suffered a severe back injury shortly before the Rashad Evans fight. It was the biggest fight of my career and there was no way I was going to pull out of it. I fought and lost and was out of action for a year rehabilitating the injury and getting ready to fight again.

“I reinjured my back 45 days before the fight with Brandon Vera. After not fighting for a year, I made the decision to not pull out of the fight. I also decided that the only way I could continue with the fight was to take injections in my back and spine that contained substances prohibited by the Nevada Athletic Commission. I also made the decision to use a product to hide the presence of these substances in a urine test.

Silva now faces a hearing on April 7th which could see him facing a suspension or fine.