The law relating to anti-doping changes rapidly. The World Anti-Doping Code was first adopted in 2003 to provide a common set of anti-doping rules applicable across all sport worldwide. The Code has evolved and changed significantly through two major processes of review. This third edition provides essential guidance and commentary on the 2015 Code which replaces the 2009 Code. The 2015 Code contains many significant changes in the core Articles of the Code, particularly in the regime on sanctions for anti-doping rule violations, and in the amended International Standards. The text outlines how the current law has developed from anti-doping rules and principles in operation before the Code and explains the central role of the Court of Arbitration for Sport in this development and in applying the current Code. This third edition will be an important single resource for any reader working or studying in the field.