" By: Scott Weaver, National Director of Sales & Marketing – Occupational Health Services A recent report by Quest Diagnostics indicated that illicit drug use by American workers is at its highest rate in more than a decade. According to Quest, the positivity rate for the combined U.S. workforce was 4.2% in 2017, up significantly from 3.5% in 2012. Increases in amphetamine, cocaine, and marijuana use lead the way in this troubling statistic. What does ...