Powell has received a four-game suspension for violating the league's performance-enhancing drug policy, the Bills' official site reports.
Powell claims he accidentally used a product that caused the positive result, but has accepted the NFL's discipline and won't appeal. He'll be eligible to return to the team's active roster in early October following the Bills' Week 4 matchup against the Falcons. Powell has hauled in just 14 passes throughout his past two seasons in Buffalo, while news of a suspension won't bode well for his chances at making the team in the long run.