Efter UFC: Stockholm 2013 framkom det att Robbie ”Problems” Peralta testat positivt för marijuana metaboliter. Som straff stängdes han av i sex månader och tvingas genomgå ett rehabiliteringsprogram.
Peralta har uttalat sig kring händelsen i ett meddelande till Sherdog.
I just want to apologize to all my friends, family, fans and to the UFC for what I did. I’m going to have to suffer the consequences, but the main thing is that I apologize to all the people I let down – my coaches, my team.”
”I’ve been going through some emotional things these past six months. When my grandma passed away in March, that’s when I made the dumb choice of smoking. We had the funeral and had a few drinks and started making bad choices. I regretted it the next day, but I’m not here to make excuses for myself. I did what I did.”
”It’s good in a way so that I never make that mistake again. It’s not worth it. It’s not worth [jeopardizing] my career. I have a lot of things going for me right now, and I just have to realize that. All of this is new for me, being in the public eye, this whole thing. I’m trying to get adjusted to it little by little and just keep moving on. I just have to make sure this doesn’t happen again and that I’m stronger mentally.”
Avstängningen gäller fram till den 6 oktober 2013.


