(Chicago Tribune) Employees increasingly are testing positive for marijuana, cocaine and methamphetamines at work, driving the rates of positive drug tests in the United States to the highest level in 12 years.
Quest Diagnostics, a leading lab services company based in Madison, N.J., on Tuesday released its annual analysis of more than 10 million workforce drug test results nationwide.
It showed that 4.2 percent of drug tests came back positive last year, up from 4 percent the year before and the highest rate since 2004, when it was 4.5 percent.
