Many states in the U.S. have legalized cannabis either medically or recreationally, but without legalization at the federal level regulation is left to states, including testing for contaminants and ...

How much cannabis is too much? A new study proposes a weekly THC limit linked to addiction risk, suggesting adults staying ...

New research suggests measuring THC intake offers a clearer way to understand cannabis health risks than counting how often ...

For decades, police have used breathalyzers to test for alcohol, but they don’t have a reliable tool to measure marijuana use. That could change soon. Researchers are working to develop a breathalyzer ...

State of Michigan officials recently chose not to set a per se level of THC in blood or saliva to constitute impairment when driving. As more results on the subject come in, it looks like the state ...