Designer steroids are anabolic steroids or other steroid-like performance-enhancing drugs designed to be undetectable in drug testing. Although anabolic steroids are banned in most athletic organizations and contests worldwide, some athletes have nevertheless sought ways around the bans. Anabolic steroids mimic the effect of male sex hormones on the body, and whether someone is using them can usually be determined by blood or urine tests. Athletes looking for the performance-enhancing benefits of steroids, without being caught by testing, have created a demand for undetectable steroids. This has led some chemists or scientists to research and produce synthetic designer steroids for sale.