Question: This Spanish agency is responsible for the protection of the right  to participate in a competition without  the use of banned athletic performance-enhancing drugs by who?
Sentence (from "Mitchell Report"): The Report to the Commissioner of Baseball of an Independent Investigation into the Illegal Use of Steroids and Other Performance Enhancing Substances by Players in Major League Baseball, informally known as the "Mitchell Report," is the result of former Democratic United States Senator from Maine George J. Mitchell's 20-month investigation into the use of anabolic steroids and human growth hormone (HGH) in Major League Baseball (MLB).
Relevant evidence: No