Performance-enhancing drugs have always been a complex crisis within sports. In the UFC , some of the greatest fighters to ever grace the octagon have been caught taking PEDs, and doubts about who takes them are a constant discussion among the fanbase, with Georges St-Pierre now giving his opinion on the sensitive topic. Throughout the heights of his time in the cage, a career that spanned 15 years, ‘GSP’ has never tested positive for any illegal substances.