The suspension is for violations of the league’s policy on substances of abuse, per the NFL Network.
Mays, a second-round draft pick by the Niners in 2010 out of USC, also spent four seasons with the Cincinnati Bengals. He played in 14 games for the Raiders last season, starting five, including the season finale at strong safety against the Kansas City Chiefs.
He had 25 tackles last year, his most since he had 31 as a rookie with the Niners, and had a career-best six passes defensed.
In his one season with the Niners, Mays played in all 16 games and had six starts, forcing a fumble and finishing with two passes defensed.
He is now, though, an unrestricted free agent, and with a suspension, he figures to stay that way for a bit.