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Dr. David Casarett used to think of medical marijuana as "a joke." But after taking a deeper look, he's changed his mind. Casarett's new book is Stoned: A Doctor's Case for Medical Marijuana.

Dr. David Casarett used to think of medical marijuana as "a joke." But, after taking a deeper look, he's changed his mind. Casarett's new book is Stoned: A Doctor's Case for Medical Marijuana.

The pot brownie you bought to help your sleeping disorder may have a lot less active ingredient than promised, a study finds. And a review of other studies finds scant evidence of medical benefits.

U.S. enforcement officials said they will not change how they treat marijuana under federal drug control laws, turning aside a bid from Democratic governors to loosen restrictions on the substance.

U.S. enforcement officials said they will not change how they treat marijuana under federal drug control laws, turning aside a bid from Democratic governors to loosen restrictions on the substance.

Early efforts to test legal marijuana are finding that it's got lots of buzzworthy THC. But it can also have fungus, chemical residue and bacteria. What that means for health and safety isn't clear.

Uber's "surge pricing" quadrupled fares for some customers trying to flee the area in Sydney where a gunman took hostages. France banned Uber's low-cost service over its lack of professional licenses.

One environmental group argues that to save wildlife, we should replace the meat in our diets with plants. But others counter that it's not so simple: Many livestock producers help conserve wildlife.

Marijuana is fully legal in two states and partially legal in many others. But businesses striving for legitimacy in the pot industry still need to stay hush-hush to avoid running afoul of the feds.