Patrol officers may soon have a new tool to detect drivers under the influence of marijuana.

Patrol officers may soon have a new tool to detect drivers under the influence of marijuana.

Labor Day weekend is the deadliest time of the year on our roads, when more impaired drivers get behind the wheel. The U.S. Department of Transportation is reminding drivers to be responsible and make safe driving decisions.

For the first time, the DOT is targeting "drugged driving". The push comes amid a spike in roadway deaths associated with marijuana, now legal in 30 states. Right now it's a challenge for police to prove impairment because they rely on the same field sobriety tests as alcohol.

Hound labs is developing a new breathalyzer that may change that allows officers to measure very small particles of THC in breath. According to the company's research, THC is detectable on the breath within three hours of smoking.

Testing of the breathalyzer will begin in select cities this fall.

A 2017 study showed almost 30 percent of cannabis users in Colorado, drive under the influence of marijuana on a daily basis.