Updated

The NFL Players Association wants to determine if the Tampa Bay Buccaneers leaked information about quarterback Josh Freeman being in the NFL's substance abuse program.

NFLPA executive director DeMaurice Smith said Tuesday, "We are sufficiently concerned about what we've heard to begin an investigation."

Freeman said in a statement released by his agent late Monday that he voluntarily entered the substance-abuse program and submitted to random testing more than a year ago after mistakenly taking Ridalin instead of Adderall to treat Attention Deficit Hyperactivity Disorder.

The Bucs benched the fifth-year pro last week after Freeman played poorly in the team's first three games, all losses. The quarterback believes someone within the Bucs organization leaked information about him being in the league's drug testing program.

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AP NFL website: www.pro32.ap.org