Field breathalyzer tests are one of the ways that police in Arizona assess whether you have been drinking before driving, and to get an estimate of what your blood alcohol concentration (BAC) is.

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 ...

Using a breathalyzer alone to effectively detect cannabis impairment could be a pipe dream, according to a recent pilot study spearheaded by the University of Colorado. A valuable tool over the past ...