BOZEMAN, Mont. -

Two Bozeman police officers recently returned from training in Wyoming with new skills to help spot impaired drivers.

Officers learned how to test for impairment from prescription drugs and medical conditions that could mimic impairment while driving.

The officers will take what they learned and help train others on the force.

NBC Montana caught up with Sergeant Brandon Olson who told us these drug recognition experts can be called to help back up officers.

"If I was out and conducting a traffic stop on an individual -- and was able to determine maybe it wasn't alcohol, but something else, causing impairment of that driver -- we can call in the DREs," said Olson.

DREs can also be called out to help other agencies such as the Montana Highway Patrol and Gallatin County Sheriff's Office.