Illicit Drug Positivity Rate Increases Sharply in Workplace Testing, Finds Quest Diagnostics Drug Testing Index™ Analysis - Jun 9, 2015

Upsurge in marijuana, cocaine and methamphetamine drive second consecutive year of increases in the positivity rate for drug tests, suggesting a potential reversal in a decades' long decline in workforce drug use

Illicit Drug Positivity Rate Increases Sharply in Workplace Testing, Finds Quest Diagnostics Drug Testing Index™ Analysis - Jun 9, 2015