New laws will let law enforcement officers in five Michigan counties administer a saliva test to drivers suspected of being under the influence of drugs.

The bills signed Friday by Governor Rick Snyder create a one-year pilot program to help determine the accuracy and reliability of saliva tests. Officers trained as drug recognition experts could give the tests in addition to a 12-step evaluation already being used.

The Michigan State Police will choose the participating counties.

Drivers refusing to submit to a preliminary oral fluid analysis will be subject to a civil infraction.

Supporters say police need ways to get dangerous drugged drivers off the road. Critics say marijuana can be detected in the body long after its effects have dissipated.