From what I know (heck, I haven't even started my first day of PT school yet, so don't be so harsh):
In the U.S., physical therapists are not allowed to prescribe and administer any type of pharmacologic compound/medicine, such as barbiturates or benzodiazepines. Unless the physical therapist received his or her education/training from a military physical therapy program, then the physical therapist may prescribe medication and order x-rays if they are on a base. Even then, I don't know if they can prescribe such drugs? I think it's only anti-inflammatories/NSAIDs. Not too sure.
However, in certain states the physical therapist may be allowed to purchase, store, and administer certain drugs as per state law and may only administer the drug or medication as prescribed and indicated by an authorized health care practioner, such as an MD, for use in physical therapy.
Do you use medications in the treatment of your patients, coralman? If so, in what state do you practice, what are the specific restrictions on the use of drugs in conjunct with physical therapy, how often do you have a case where you are allowed to administer medication, types of cases you would use it in, etc.
Sorry for the host of questions, but rarely do I see or meet a PT that has any ample experience in this type of area. Allowing PTs to prescribe medication is a controversial issue. I myself am not sure where I exactly stand on this issue. On one hand it could be good, helping patients with their pain and in one way or another facilitating their recovery. However, problems with liability, philosophy, education, and contraindications (among others) abound...