Some companies, particularly in industries involving heavy machinery, are interested in finding a way to control staff use of marijuana, now that it is legal in 10 US states and some countries around the world. View the full article here >

THC is present in extremely low concentrations in breath. […] “It came down to finding the needle in 10,000 haystacks,” said [Mike] Lynn. View the full article here >

“There is no good roadside test,” [Mike Lynn] said. “The challenge even with drug recognition experts who really do have a lot of training is there’s some subjectivity. We’re trying to provide the objectivity.” View the full article here >

In 2018, the first full year of [California’s] prop 64, there were 333 DUI marijuana arrests — that is a 69 percent increase [from 2017]. View the full article here >

An American company is still conducting field tests on its roadside device it says can detect whether the driver has consumed marijuana within the last two hours, considered to be the peak time of impairment. View the full article here >

Breath is the only place in the body where THC remains for just a few hours after smoking, which makes it a much more useful indicator of recent use and possible impairment than any other THC drug test.   View the full article here >