Organizations in the United States that tested employees for drugs saw a 9.3% jump in the number of positive drug tests for illicit drugs in the general workforce, to 4.7% in 2014 from 4.3% in 2013, according to data from Quest Diagnostics. 

The Quest Diagnostics Drug Testing Index (DTI) also shows that overall positivity for oral fluid and hair drug tests, representing approximately 1.1 million tests, increased between 2013 and 2014 in the general U.S. workforce.