there is a federally approved medicine on the market, marinol. is it not a decent substitute?it is a synthetic form of thc. you get rid of the compounds we don't know a lot about. one of the disadvantages is it is a pill. one thing about using marijuana, smoking it or vaporizing it, you can tie trait it more easily and get the appropriate dose. with the pill you may take too much or too little. >> interesting information, good facts. >>> up next, how marijuana gets into the u.s., across the borders from coast-to-coast. we'll map it out. florida, a drug trafficker's paradise. buying cheap homes and growing pot farms in those homes. it could be happening in your neighborhood. >>> marijuana is grown in national parks and forests by mexican drug cartels aimed with ak-47s. randy kay went on a raid. >> it is easy to take a pot garden down. once these guys come across the plants they just yank them right out of the ground. it is that simple. and feel better fast. ceit keeps my airways open... to help me breathe better all day long. and it's not a steroid. announceit keeps my airways.

if you talk to patients who used marinol, they will say nice try but it is not as effective.u inhale marijuana. >> aaron you're the group responsible, partly responsible for putting that ad out looking to make marijuana legal for all purposes, not just medicinal. why now? why are you starting this in the state of california? >> well, the state of california is a logical place to start because it has a crippling budget deficit facing that state right now. additionally california was the first in the nation to make medical marijuana available for seriously ill patients. additionally, california could make -- run a billion dollars in tax dollars from legalizing it, taxing and regulating marijuana like alcohol. but more importantly and more broadly across the board, marijuana is the nation's largest cash crop valued at $36 billion a year, bigger than corn and meat combined. and partially because of that the mexican drug cartels which have gotten such notoriety recently actually make 70% of their profits from marijuana sales alone. which is a remarkable figure. staggering. they're