OKLAHOMA CITY (AP) — Oklahoma primary voters were weighing Tuesday whether to approve one of the least-restrictive state laws allowing medical marijuana, the nation's first cannabis ballot question of the year.

State Question 788 , the result of an activist-led signature drive launched more than two years ago, would make it legal to grow, sell and use marijuana for medicinal purposes. The proposed law outlines no qualifying conditions, which would allow physicians to authorize its use for a broad range of ailments — a fact that has sparked bitter opposition from law enforcement, business, fait...