Report - 16 May, 2017
Marijuana positivity has increased "dramatically" in the last three years, Quest said, due in part to recreational legalization in some US states.
Marijuana positivity through oral fluid testing has gone up by 75 percent since 2013 among the general US workforce and has also risen in both urine and hair testing. Among the federally-mandated workforce, marijuana positivity increased by ten percent from 2015.
Both Colorado and Washington state, the first two states to legalize recreational marijuana in the US, had urine positivity rates for marijuana that exceed the national average, Quest reported.