An update on regulatory issues in antidoping programs in sport.

Doping control for national- and international-level athletes has undergone major changes in the past few years, and will continue to change at an accelerated rate. National antidoping organizations (NADOs) such as the United States Anti-Doping Agency (USADA) are being established by major nations to work with national governing bodies of sport. The World Anti-Doping Agency has been established to coordinate worldwide antidoping efforts with the NADOs and international federations of sport, and to implement a recently drafted World Anti-Doping code, which clarifies the definition of doping and establishes procedures to harmonize international efforts in sample collection process, testing laboratory accreditation, result reporting, and result adjudication.