I think you're considering "transfer" in the wrong terms. It is illegal for people to distribute prescription drugs to others for use or consumption. But it is not illegal for a person to purchase and carry (essentially acting as an agent) prescription medication for another.
I suspect that your correct regarding the use of the word "transfer".I routinely picked up my Dad's prescriptions when he was living with me.
But assuming that we're both correct on this matter,is what happened with Rush (assuming that the news report is accurate) a crime? Did the doctor involved "transfer" the drug to Rush in a way that violated state or Federal law (drug laws,laws that regulate pharmacy practices,etc) or laws (or "standards") concerning the practice of medicine.
So who,if anyone,is in trouble here? Rush? The doctor? Both?