If your product is at all worthwhile, it will constantly be tossed back and forth between lawyers, trying to uphold or disprove its validity. ("Well here's an independent study done on how arresting officers with shaky hands get inconsistent results when administering the SannTek Cannibus test" et al et al ad nauseum) While yes, this is a problem in any society that applies capitalism principles to the practice of law.... I don't think there's necessarily a better system, sadly. Don't feel responsible to fix it all yourself. Anyway, pursue the technology as well as possible, by all means work in as many checks and balances as possible for correct use, and constant calibration, BUT ALSO talk and document openly during your design phase and testing the ideology you develop to govern false positives versus false negatives. This is an extremely engaging technology ethics discussion. If you drive the error to be false negatives, at a rate of 5%, will you not be able to sell it, because your customer is most interested in an effective tool? What is the societal benefit of getting this device to be accepted and used by the police? If you can achieve FN=4% is it worth it, or is the societal benefit actually much higher, possibly at FN =20%. Can you just run the test 5 times in a row, or with 2 stand alone devices to reach the dependability rate you desire? If you drive the error to be false positives, at a rate of 1%, can you sleep at night with the lives your product will effect, or do you need a fall back like your device determining with 100% accuracy that cannibus is present in someone's system (just not a definitive, exact amount), PLUS a statement from an arresting officer stating erratic or dangerous driving or behavior in conjunction with your device's input. I'm very excited about what you're doing. I didn't know (still not yet convinced) that the science is solvent, but I've been asking about this device for years.