stephen you should visit http://www.safeaccessnow.org/
your goal is imposable its the same goal the Temperence movement had and that utterly failed and lead to organized crime that caused way more harm than alcohol did. its a fact you can not legislate a mans apatite if he wants something he will find a way to get it illegal or not the question is if we want him to go through the right channels to acquire it.
and by the way the pill your talking about is called Marinol and its not cheep at all because the pharma industry is a sham and guess what study s have found it is no where near effective as MJ because it doesn't contain the other ingredients that the buds have it is not just THC it is everything another failure where mother nature has done it 100X better than man could hope.
i don't support drug cartels but to think that if we actually had a legal supply and american citizens could choose who to go and spend their money on what they wanted it would do more than any drug war could have ever dreamed of doing to stopping the cartels its just a fact.