Natural bodybuilding may refer to one of several types of approach to the sport of bodybuilding. Most commonly it means bodybuilding without the use of illegal performance-enhancing drugs such as anabolic steroids and human growth hormone.Drug testingIn natural contests, bodybuilders are routinely tested for illegal substances and are banned for any violations from future contests. Testing can be done on urine samples, but in many cases a less expensive polygraph (lie detector) test is performed instead. What qualifies as an "illegal" substance, in the sense that it is prohibited by regulatory bodies, natural federations, and does not necessarily include only substances that are illegal under the laws of the relevant jurisdiction. Anabolic steroids, Prohormone and Diuretics are generally banned in natural organizations. Natural bodybuilding organizations include NANBF (North American Natural Bodybuilding Federation), and the NPA (Natural physique association). Natural bodybuilders assert that their method is more focused on competition and a healthy lifestyle than other forms of bodybuilding.Drug testing bodiesDrug testing is generally organized at a national level. Often the body engaged by the sanctioning Federation/Promoter is the national drug/anti-doping body of the jurisdiction.The national drug/anti-doping bodies are organized under the auspices of the World Anti-Doping Agency(WADA). They include: