So common that the only explanation is these are being done deliberately. This makes sense as those who introduced and promulgated the mythology that these biomarkers differentiate incidental exposure from drinking did so for opportunistically for profit and out of greed. These labs are not FDA approved and have no accountability as there is no agency that has the ability to both investigate false tests and impose these labs for wrongdoing. That is why they are able to misleadingly market tests these tests as indicative of proof of alcohol ingestion. As they are unregulated they can basically say whatever they want. The only agency that is able to investigate false or fraudulent tests is the College of American Pathologists and all they can do is force the labs to correct an erroneous test and "educate" them to do better next time no matter how serious the misconduct or how often it occurs. Likewise the agencies ordering these tests and the "approved" assessment and treatment centers that profit from the referrals generated by these tests when they return positive had no real accountability-particularly when no insurers are involved and the victim is responsible for payment. Giving someone a positive test near the end of the monitoring contract typically resets the contract and guarantees another windfall of cash for more assessments, more unneeded "treatment" and more costly testing which lining their pockets with cash and virtually no chance of getting caught for it and that is what these low-lives do.