Sure, this would be okay... it is just using a prescription with someone else's name on it that is a problem.
I doubt the people going through his luggage would think so, if they ran across samples of perscription drugs in Rush's suitcase. In fact, I bet they'd make just as big a deal over it.
HEADLINE: RUSH LIMBAUGH CAUGHT WITH PERSCRIPTION DRUG SAMPLES OF VIAGRA; WITH NO PERSCRIPTION!!!!