Medical Marijuana: Prop 203's Passage Means a New Billion-Dollar Industry for Arizona Phoenix -- In Arizona, you can ride a motorcycle without a helmet, conceal a handgun, and buy an AK-47. And soon, if you qualify, you'll be able to smoke a big, fat doobie. Legally. Proposition 203, the state's new medical-marijuana law, passed by the slimmest of margins once all the votes from the November 2 election were finally counted. But it passed by 4,341 votes, and now Arizona is on the verge of establishing a billion-dollar pot industry. The official canvass of votes from the election will take...