Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia . 
a) Safety – The use of any legal or illegal substance, or combination of substances, which when taken into the human body, can impair the ability of the person to perform safely is prohibited. Under this policy, any substance or combination of substances used in an unsafe manner is a violation. For example, a combination of drinking 10 cups of espresso, taking cold medicine and using prescribed sleep medication will cause a safety risk, although each substance in small amounts by themselves may not necessarily result in a violation of the SAP.