Acting Attorney General Todd Blanche said he is immediately moving medical marijuana from Schedule I to Schedule III, which includes drugs like ketamine, Tylenol with codeine and anabolic steroids.
A new analysis represents the largest effort yet to systematically parse all the data from high-quality clinical trials on cannabis and mental health. The evidence is lacking.
Researchers followed more than 400,000 teens until they were adults. It found that those who used marijuana were more likely to develop serious mental illness, as well as depression and anxiety.
Farmers in the U.S. have grown cannabis since the 1600s — but policymakers are still figuring out how to regulate two famous types of Cannabis sativa. A historian calls the plant "incredibly cryptic."
President Trump set the process in motion to ease federal restrictions on marijuana. But his order doesn't automatically revoke laws targeting marijuana, which remains illegal to transport over state lines.
Drinks infused with cannabis' buzzy compound THC are wildly popular and available in many states. But a year from now, the hemp-based products could be banned under a newly approved federal law.
It's trendy in some circles to replace drinking with consuming cannabis. But can it help people with a drinking problem cut back? Scientists set up a bar in the lab to find out.
Millions of Americans use weed to treat chronic pain, but there's little high quality research on whether it works. New findings suggest it can be effective for low back pain, on par with opioids.
With no help from the federal government, states are trying to regulate recreational marijuana. California's Department of Cannabis Control works to keep contaminants out of joints, vapes and edibles.
Millions of Americans use cannabis and would like to think the products they buy are safe. But regulation is state by state and full of holes. NPR's new series digs into the risks and solutions.
