It sounds to me like the real problem is what appears to be a screening tool being used as evidence of guilt. For other examples: field drug test kits--they r

It sounds to me like the real problem is what appears to be a screening tool being used as evidence of guilt. For other examples: field drug test kits--they really only say "this might be drugs", but the prosecutors use jail to try to get people to plead guilty rather than promptly doing a proper test. Also, the ubiquitous breathalyzer--it's actually coded into law as proof in many places but it's not. There is an inherent biological flaw that makes the readings inaccurate.