All I know is what’s happened to me. After a two false positives (contradicted by back-up tests I paid for myself from another testing facility), my judge said a toxicologist could be engaged to speak to the contradictions and vindicate me. Since then there have been 3 more false positives similarly contradicted by back-up tests, & I’m headed to court with said toxicologist soon to hopefully put this behind us. It cost me my kids thru no fault of my own, no alcohol consumption at all.
My ONLY positives were from one testing facility. All others from different places have all been negative, as they should be. Covering yourself with back-up tests is expensive but worth it.