One third of U.S. industry sectors experienced year-over-year double-digit increases in workforce drug positivity between 2015 and 2018, according to a new analysis of industry-specific data by Quest Diagnostics.

The analysis of more than 14 million urine drug test results provides industry specific insights based on objective lab data identifying the presence of several drugs, including marijuana, amphetamines, cocaine, and opiates across a nationally representative workforce population. Among these, the Retail Trade industry experienced the highest overall positivity rate across all four years of the analysis.