The NFL suspended Buffalo Bills running back Karlos Williams for the first four games of the 2016 season for violating the NFL Policy and Program for Substances of Abuse.
The running back can participate in all offseason and preseason practices and games.
In a statement, the Bills said, "as an organization, we are disappointed that Karlos has put himself in this situation. Poor decisions such as this affect not only the individual, but the entire Bills organization. We will continue to work with Karlos through the various player programs we provide to assist him in making better decisions moving forward."
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As a rookie, Williams earned 517 yards on 93 carries and seven rushing touchdowns. Among all players with 90-plus carries last season, Williams had the second-highest yards per rush in the NFL in 2015.