Indiana doesn't currently have a method for testing if someone is too high to drive, but a bill proposes setting the bar at 5 nanograms. (Stock photo by Ivan Balvan/Getty Images) Marijuana, and the ...

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 ...

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 ...