The rate of workforce drug positivity hit a 14-year high in 2018, according to analysis by Quest Diagnostics released in April. Marijuana continues to top the list of the most commonly detected illicit substances across all workforce categories. The number of workers and job applicants who tested positive for marijuana climbed 10 percent last year to 2.3 percent.
Positivity rates in the combined U.S. workforce increased nearly 5 percent in urine drug tests (4.2 percent in 2017 vs. 4.4 percent in 2018)—the highest level since 2004.
In the general U.S. workforce, the positivity rate for opiates in urine drug testing declined across all opiate categories by 21 percent between 2017 and 2018, the largest drop in three years.