Prosecutors want to question Rush Limbaugh's (search) physicians in their probe of the conservative commentator's possible "doctor shopping" for prescription painkillers, according to a motion filed Tuesday.

Prosecutors believe Limbaugh illegally deceived multiple doctors to receive overlapping prescriptions for painkillers. He has not been charged with a crime.

Limbaugh's attorneys argue the request for depositions from the doctors and their employees could reveal privileged medical information.

Limbaugh has acknowledged an addiction to pain medication, attributing it to severe back pain, and took a five-week leave from his radio show to enter a treatment program in October 2003.

The criminal investigation into Limbaugh's drug use has been ongoing for nearly two years. Throughout, his attorneys have fought vigorously over privacy concerns.

Assistant State Attorney James Martz told the court Tuesday he would ask the doctors and their employees only about matters relating to Limbaugh's possible "doctor shopping."

Limbaugh has accused Palm Beach County State Attorney Barry Krischer, a Democrat, of a "fishing expedition" that's politically motivated.