Memphis Grizzlies point guard Nick Calathes has been suspended 20 games for violating the NBA's anti-drug policy, a person with knowledge of the situation confirmed to USA TODAY Sports.

The drug that was detected, according to the person, was tamoxifen. The person spoke on the condition of anonymity because the details of the drug test are not typically disclosed. The NBA confirmed the suspension for tamoxifen late Friday night.

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