World Anti-Doping Agency

Anti-doping agency's view of recreational drugs has shifted over the years

When Danny Harris tested positive at a 1992 track meet, no one really believed the star hurdler was trying to enhance his performance or otherwise cheat.

But the cocaine in his system was classified as a stimulant — a banned substance — so he became the first athlete in the history of his sport to be sanctioned for using the “recreational” drug.

Twenty-five years later, his case remains an early example of a long-running debate in the anti-doping world.

Marijuana, cocaine and heroin currently appear on the World-Anti Doping Agency’s prohibited list. But they fall into a slightly different category than known performance-enhancers such as steroids and...