Michigan news: Roadside testing to include drug testing (if impairment is suspected)

But is it accurate? Answer unclear, ask again later. 

The pilot program is expected to last for a year. If a driver is suspected of impaired driving, a specially-trained officer can use a handheld device to test that person's saliva for the presence of certain drugs.

Drugs that can be tested for include amphetamine, benzodiazepines, marijuana/cannabis, cocaine, methamphetamine and opiates.

Article here.