ETG/ETS urine. Non fda approved. Non creatinine normalized. Overly sensitive, prone to environmental exposure false positives. Also prone to giving you problems if you drink too much water to make sure you can pee.
PETH. Usually a finger stick. Prone to preanalytical false positives especially during warm humid periods of time. Only one lab in the US offers this. Go to their web site, read the collection procedures and make SURE they’re followed TO THE LETTER. Also non fda approved.
The whole blood lab corps test is a clinical draw, so switched samples are an issue. This has been seen! The guy only lost his medical and ability to work for a year or so, so this is considered acceptable by faa standards.
SOBERLINK. Don’t know as much about this one. Honestly, a good smart phone, service provider and signal coverage are likely the most important aspects.
Your HIMS AME will likely tell you he’s not an expert in biomarker testing, so you better damn well be, your medical (and career?) depend on it.