An anabolic steroid "designer drug" developed to avoid detection in drug tests.

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Tetrahydrogestrinone (THG) is a designer steroid that was developed to avoid detection in drug tests. It was originally created by Patrick Arnold, who marketed it under the name "The Clear." THG was not included on the list of banned substances at the time, so athletes who used it were not penalized. It wasn't until after the 2004 Olympics, when several high-profile athletes tested positive for THG, that it was added to the World Anti-Doping Agency's banned substance list.

An Anabolic Steroid "Designer Drug" Developed to Avoid Detection in Drug