The federal government is taking a new approach to testing for recent cannabis use, exploring a revised protocol for screening breath samples for THC. It’s the latest in an ongoing effort to find more reliable, accurate ways of field testing for marijuana impairment in drivers and others.

Researchers at the National Institute of Standards and Technology (NIST) and the University of Colorado say that taking two separate breath samples within an hour of one another might yield better results than just a single test does. The goal now is to see whether the approach can be translated into a usable field test.

“If their research is successful,” NIST said in a press release about the project, “it could lead to a roadside test for cannabis use that involves two breath tests given at a specified interval apart.”

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