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Sha'Carri Richardson's Olympic drug ban: Why is marijuana a prohibited substance?

Sha’Carri Richardson, the 21-year-old sprinter expected to star at the upcoming Tokyo Olympics, has been suspended and barred from running her signature race in Tokyo after testing positive for marijuana.

The drug has been decriminalized in most U.S. states, including in Oregon, where Richardson's positive test occurred. Many athletes use it for reasons both medicinal and recreational. The NFL, NBA, MLB and NHL no longer suspend players for it.

And yet, “all natural and synthetic cannabinoids,” including marijuana, remain prohibited by the World Anti-Doping Agency, or WADA, the International Olympic Committee-affiliated body that regulates drug use in global sport.