California Highway Patrol Officer Gary Martens, right, has CHP Sgt. Jaimi Kenyon, follow his finger during a demonstration of how drivers, suspected of impaired driving, are currently tested, Wednesday, May 10, 2017, in Sacramento, Calif. Three of California's largest counties are testing a device that can detect the presence of drugs in saliva within five minutes. Some officers and lawmakers want the devices used statewide after voters passed Proposition 64 in November, legalizing the recreational use of marijuana. (AP Photo/Rich Pedroncelli)