Why is it medical marijuana isn’t sold by pharmacies?
Actually it is. The active ingredient delta-9-tetrahydrocannabinol (THC) can be purchased in a pill form with a prescription. Same high, just a lot cleaner and a lot less expensive but not as cool.

If it’s such an important drug in the treatment of certain medical conditions, why isn’t it better controlled? That just it. Its not an "Important drug" in the treatment of anything, other than an escape from reality. It is the option of many in law enforcement, that the law was changed because the 40-70 year old crowd got tired of being arrested for smoking it. Truth is that if you really are in pain, you will want something that works...and for 99% of the people out there, its going to in pill/liquid form from a pharmacy.