Breathalizer is the only Test proven effective for Roadside Read this....
" … THC stays in body fluids for many days or even weeks,” said Lynn from Hound Labs. “Breath is the exception. THC can only be measured in breath for a couple of hours, then it disappears. This two-hour period aligns with the window of impairment identified by researchers.”
Taken from the Mar. 6, 2017 Article ...
The current methods to detect THC test saliva, sweat, blood, or urine, but they cannot conclude whether someone used marijuana moments before driving down a freeway, or at a weekend party, or as a sleep aid two weeks ago.
“ … THC stays in body fluids for many days or even weeks,” said Lynn from Hound Labs. “Breath is the exception. THC can only be measured in breath for a couple of hours, then it disappears. This two-hour period aligns with the window of impairment identified by researchers.”
Cannabix Technologies stated in a press release that it is also navigating the two-hour window at the time of testing for optimal breathalyzer results. Its breathalyzer “consists of proprietary components, including a generator enabled by the latest chip technologyto provide extremely fast high-voltage square wave transitions that significantly improve chemical separations, and a novel plasma ionization source that provides efficient ionization with a relatively small footprint.”
Hound Labs has conducted tests with the volunteered cooperation of several law enforcement departments across California, reports LA Weekly. Cannabix “expects to begin pre-trial live subject testing during the month of March.”