Palm Beach prosecutors investigating Rush Limbaugh all but admitted this week that they currently have no real evidence that the number one radio host violated Florida's drug laws - and won't be able to prosecute the top talker for "doctor shopping" unless a judge lets them look for evidence in Limbaugh's confidential medical files. State Attorney Barry Krischer made the startling admission in a brief filed with Florida's 4th District Court of Appeals, which is currently weighing whether Limbaugh's medical records are fair game. In the filing Krischer confessed, "The State will not be in a position to know what...