Now, with more states legalizing the use of marijuana, similar devices are being developed to measure other drug levels in a person’s system.
Unlike alcohol breathalyzers, police have had no devices for measuring marijuana levels during traffic stops.
The devices are designed to measure levels of THC, the substance that gives marijuana users the mental state called a high.
The company says it has created the world’s first device to measure both alcohol and marijuana levels in a person’s system.
The study, led by researchers at the University of California, San Francisco, found the device can measure THC throughout a three-hour window after a person smokes marijuana.
A Canadian-based company called SannTek Labs is also developing a breathalyzer device to measure THC levels.
The company’s website says its breathalyzer can measure both alcohol and THC levels.