Puff the Magic Dragon Farms

I think the world is ready for my idea.
Legalize marijuana to be grown on large privatized farms. Marijuana would then be able to be studied for medical components, products such as clothing and paper, and it supposedly adds to the soil, rather than depleting it. It uses small amounts of water and could be marketed, sold and taxed.
The farms could be manned by our specialty groups of disfranchised souls: Sexual predators, illegal aliens, and the homeless. Each farm would have its parameters. For example, the sexual predators that cannot live near schools or parks can live on a marijuana farm that has no children and is miles from such facilities. The homeless people such as the 97 year old lady I read about in the LA Times today, would have a clean bed and shower and meals. http://www.latimes.com/news/local/la-me-bessie16-2009oct16,0,7618199.story Why, because the farms would create their own revenue. No tax dollars here. Everyone would have tasks, unless they are too crazy, but perhaps a little of the maryjane would help straighten them out. haha.
So many medicines come from herbs, and this herb must have medicinal properties that could be exploited.
Think of places that would house and protect homeless people without them being on the dole.
Think of a country that has a place for registered sexual predators that would give them productive work without being around the objects of their compulsions.
Think of a legal place for illegal aliens to work without objection.
Think of the revenue that would come from these farms.
We will never have a drug free world. Why can't we cash in on a love affair of marijuana?