During a visit to a Vancouver, B.C. elementray school, Seahawks cornerback Richard Sherman made a big claim about the use of Adderall in the National Football League.

About half the league takes it (Adderall) and the league has to allow it, Sherman told the Vancouver Sun, in reference to his suspension last season. The league made a mistake in my case. Obviously, I didn t do anything, but you have to go through a process to prove you didn t do anything. There are still naysayers out there who don t believe me. But I accept it. If everybody loves you, it probably means you re not much of a player.

Sherman took part in an assembly at Cambridge Elementary School as part of NFL Canada s Take An NFL Player to School Program.

Adderall is a prescription stimulant used to treat attention deficit disorder and hyperactivity in adults. Both Sherman and his teammate Brandon Browner were suspended for using a substance on the NFL's banned list.

Sherman appealed his four-game suspension for use of performance-enhancing drugs and won last December. Browner did not appeal and sat out four games.

Players are allowed to take Adderall only if approved by the league for medical reasons.

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