From the Wall Street Journal:
More American workers are testing positive for marijuana, a new report finds, as lawmakers in New Jersey and Illinois push to join nearly a dozen more states where recreational use of the drug is now legal.
The number of workers and job applicants who tested positive for marijuana climbed 10% last year to 2.3%, according to an analysis of 10 million urine, saliva and hair samples by Quest Diagnostics, one the nation's largest drug-testing laboratories. The Quest data, which is set to be released Thursday, found 4.4% of the analyzed samples contained traces of both legal and illegal controlled substances including pot, prescription painkillers and other drugs—the highest such rate since 2004.
Since then, the number of drug tests showing signs of cocaine, heroin, prescription sleep aids and certain opiates like morphine has fallen sharply. But the tests indicate marijuana use has steadily risen for the general U.S. workforce, including among employees in safety-sensitive jobs such as airplane pilots, nuclear power-plant operators and train conductors.