![Herbert Hill](https://wpcdn.web.wsu.edu/wp-cas/uploads/sites/648/2014/11/herbert-hill.jpg)
Washington State University researchers are working to develop a roadside test that would detect marijuana in a person’s breath.
Studies began last month on a prototype that tests breath for THC, the chemical responsible for most of marijuana’s psychological effects.
Public interest in the research is high, though “we have a long way to go before we have a dependable test for THC,” said Herbert Hill, a WSU chemistry professor, who spoke at a medicinal plants conference last week in Spokane.