Across the United States, many employers include drug screening as an integral part of their hiring process. These employers believe that only a drug-free workplace can increase productivity and make ...

Although marijuana is still a Schedule I substance and illegal under federal law, many states have legalized its use in recent years. A Pew Research Center analysis found that 54 percent of Americans ...

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 ...