Assuming that your story isn't just an invention, this so-called doctor was so astoundingly ignorant that he didn't know what "prescription" means. That would make him a quack.
Prescription: A physician's order for the preparation and administration of a drug or device for a patient. A prescription has several parts. They include the superscription or heading with the symbol "R" or "Rx", which stands for the word recipe (meaning, in Latin, to take); the inscription, which contains the names and quantities of the ingredients; the subscription or directions for compounding the drug; and the signature which is often preceded by the sign "s" standing for signa (Latin for mark), giving the directions to be marked on the container.
Since you're determined to ignore my post #89, which shows a university and a law organization assuming the same equality between prescription and recommendation, how about addressing some of the other issues? Like the fact that there isn't sufficient research because the federal government makes it very difficult to do the studies, that they control the supply and several researchers say they can't get the quality or quantity they need for studies? That the MS society supports the research? The bottom line is that marijuana isn't treated like other drugs, including those which are far more addictive.