Article content The percentage of Quest-tested U.S. workers with urinalyses that came back positive for illicit drugs has remained consistently around 4.4 per cent since before the start of the pandemic. “Driven largely by surging rates of marijuana general U.S. workforce positives and steady rates of amphetamines positives, the rate of drug positivity remained stubbornly high despite seismic shifts to the workplace caused by the COVID-19 pandemic,” said Barry Sample, Ph.D., senior director of science and technology, Quest Diagnostics in a press release. The National Safety Council’s se...