More American workers are failing tests for illegal drugs these days than in many years. Quest Diagnostics reports that 4.2% of the 8.9 million employee drug tests it administered last year came back positive; that’s the highest rate since 2004. Marijuana remains the most prevalent, though other drugs are also on the rise. This is especially surprising, given the fact that so many states have looser laws on marijuana use for medical or recreational purposes. …
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