In a study conducted by Quest Diagnostics, less than 2 percent of workers in the United States tested positive for marijuana use through workplace drug testing. Back in 2002, just under 3 percent tested positive for marijuana.
The fall in workers testing positive stands in contrast to the numbers of Americans who use marijuana. According to reports by public health programs, 7.3 percent of Americans admitted to smoking marijuana within the previous month, an increase from the 5.8 percent in 2007.
The use of prescription drugs by US workers increased dramatically in recent years, according to the study. The use of Adderall and other types of amphetamines doubled between 2002 and 2012. Since 2005, the use of Vicodin by workers rose by 172 percent, and OxyContin use increased by 72 percent.
Source: Roberto A. Ferdman, “Americans are smoking more weed, but testing positive less often,” Quartz, November 18, 2013.
Source: Charlotte Alter, “Study: Fewer Workers Using Cocaine and Marijuana, But Prescription Drug Use Is Up,” Time, November 18, 2013.