Garoppolo was not available to comment. Neither his representatives nor the Raiders responded to requests for comment.

The NFL and the NFL Players Association jointly developed the league’s policy on performance-enhancing substances, which dictates a player be suspended for two games without pay for a first violation related to a positive test for a stimulant, diuretic, or masking agent. A first violation for a positive test related to an anabolic agent results in a six-game suspension without pay.

According to the policy, a player may not have a prohibited substance in his system without a valid therapeutic use exemption. ESPN reported that Garoppolo’s suspension is related to his use of prescribed medication without a valid therapeutic use exemption, and he is not appealing. Players have the right to appeal under the policy.