WEST PALM BEACH, Fla. (AP) - Investigators raided the offices of Rush Limbaugh's doctor Thursday, saying in search warrants that the conservative radio commentator engaged in illegal drug use and "doctor shopping" for prescription painkillers. The warrants show investigators were looking for records including prescription disbursements, appointment schedules, receipts and a medical questionnaire. "Mr. Limbaugh's actions violate the letter, and spirit" of the law that relates to "doctor shopping," stated one of warrants, signed by Asim Brown, a law enforcement agent assigned to the state attorney's office anti-money laundering task force. Doctor shopping refers to looking for a doctor willing...