CLARION, Pa.—The Pennsylvania Board of Medicine says a western Pennsylvania doctor has voluntarily surrendered his medical license because of unprofessional conduct which a prosecutor says is linked to an investigation that he overprescribed drugs and traded some drugs for sex.

Sixty-six-year-old Thomas Radecki, of Clarion, didn't immediately return a call for comment Friday.

Clarion County prosecutors have confirmed the investigation, which is being handled by the state attorney general.

Radecki had offices in Clarion, Dubois, Kane and Seneca and opened a clinic in Dubois in March where he dispensed drugs meant to wean people off of heroin and similar drugs.

The clinic closed after a search by state attorney general's agents in June, who also seized records and other evidence from his home and four medical offices.