<p>WEST PALM BEACH, Fla. (AP) -- Investigators who raided the offices of Rush Limbaugh's doctors said in search warrants filed yesterday that the conservative radio commentator had engaged in illegal drug use and "doctor shopping" for prescription painkillers.</p>
<p>The warrants -- which name four doctors and several prescription drugs -- show that investigators were looking for records, including prescription disbursements, appointment schedules, receipts and a medical questionnaire, when they raided the offices on Nov. 25.</p>