Limbaugh agreed to drug testing as part of his plea bargain. I hope this is only about the Viagra.
Actually possession of prescription medication ("drugs") which are not prescribed to the possessor is technically a drug violation. Rush says his doctor had the drugs placed in the doctor's name for privacy reasons.[You know any pharmacy Rush filled a vaigra prescription would be on the horn to the National Enquirer or Howard Dean]. Hope that Doctor then handed the drugs to Rush. If that is what happened, then the Doctor "prescribed" the drugs to Rush just like Doctors used to dispense us drugs in little envelopes.
Customs guys go ape when they find pills and they are in little bottles that do not match the occupants of the aircraft. Too early to assume anyone set him up, but it is always stupid to talk to cops without your lawyer. It is doubly stupid to get caught in the county where the Prosecutor hates you. (ala Michael Jackson in California).
Maybe he was testing the Viagra?