Roadside Marijuana Test Equipment

Why it s difficult to develop a roadside test for marijuana written by matt berger updated on september 24 2018 police in colorado and california are using tests to see if drivers are high. The ability to properly test marijuana impairment with roadside devices remains front and centre seven months after legalization with at least one possible legal fight brewing. Stanford engineers are developing a portable device that measures thc levels in saliva a step toward creating a roadside test for driving under the influence of marijuana.