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 ...

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 ...