Ravens rookie cornerback Asa Jackson has been suspended without pay for the team's next four games for violating the NFL policy on performance enhancing substances, according to NFL spokesman Corry Rush.

The suspension stems from usage of Adderall, not steroids, according to a source with knowledge of the situation.


Jackson’s suspension begins immediately and will cost him four game checks totaling $91,764 at $22,941 per week.

If Baltimore clinches a playoff spot, Jackson will be eligible to return to the Ravens' active roster on the day following the team's first playoff game.

Jackson is a fifth-round draft pick from Cal Poly.

Multiple NFL players, including Seattle Seahawks starting cornerbacks Brandon Browner and Richard Sherman as well as New York Giants safety Will Hill and Tampa Bay Buccaneers cornerback Eric Wright, have been suspended this season for testing positive for Adderall.

Adderall is a prescription drug intended to aid those with attention deficit hyperactivity disorder and increase their focus and behavior control.

Under NFL rules, players may apply for a therapeutic use exemption allowing them to take Adderall.

If players are caught using Adderall without permission, they're subject to discipline under the NFL performance-enhancing drug policy.

NFL senior vice president Adolpho Birch, the league's point man on law and labor policy, told the Associated Press last month that he believes use of Adderall is a growing issue around the league.

"It's not a secret that it's a societal trend," Birch said. "I think we're starting to see some of the effects of that trend."