Are racing drivers tested for performance enhancing drugs?

We do, but the procedure depends on the series. In Formula 1, they do follow WADA standards. F1 drivers are subject to regular drug tests at random times during race weekends and between races. read more

In NASCAR, drug tests (for performance-enhancing or recreational drugs) used to be administered when there was "reasonable suspicion" on the driver, but in recent years they have been testing all drivers and crew members before the start of the season, as well as at random times during the season. read more

In order to dope effectively for circuit-racing, a driver would need to perfect a cocktail of drugs, taking something like Ambien or Adderall to boost focus, steroids of whatever ilk to boost muscle mass in training, amphetamines or related stimulants to kill the appetite and maintain the slim physique the teams demand for ballast options, and much more besides. read more