California Highway Patrol Sgt. Jaimi Kenyon blows into a alcohol breathalyzer during a demonstration of devices used to test drivers suspected of impaired driving May 2017, in Sacramento, Calif. Lawmakers and police are hoping new devices will be developed to effectively test for marijuana use by drivers. (Rich Pedroncelli/AP)

The pot breathalyzer is here. Maybe

With few accurate roadside tools to detect pot impairment, police have to rely largely on field sobriety tests developed to fight drunk driving or old-fashioned observation.

2 weeks ago