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A California company has created a breathalyzer device that could someday be used by police officers to decide whether a person is too high to be driving.

Emergency room physician Dr. Mike Lynn, CEO of Hound Labs, told Stuart Varney that the handheld device would tell an officer how much THC - "the stuff in pot that makes you stoned" - is present in a person's breath. 

Right now, there are no standards on allowable levels of THC. Lynn said he hopes his company's device can help in creating those standards. 

He said the current tests for marijuana are conducted on a person's blood or urine, but those results do not tell when a person actually smoked marijuana. 

"THC only stays on your breath for a few hours at the most. If it's in your breath, the cop knows you smoked recently and we can link that to standards that relate to impairment," said Lynn.

He added that Hound Labs is working with law enforcement and a professional race car driver on road tests to show how certain levels of THC relate to impaired driving. 

Earlier this month, the San Francisco Chronicle reported that Alameda County sheriff’s deputies would begin carrying prototypes of the device and conducting voluntary roadside tests. 

Watch the full segment above and watch Varney & Co., weekdays at 9a ET on Fox Business Network.

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