What test that can determine someone has never drank alcohol?

Moving the goalposts, eh?

They're not moving the goalposts because the goalposts were never where you thought they were. There's nothing wrong with proposing a study such as yours but if you don't anticipate all the possible influences on your study then you'll only end up with data which is (potentially unknowingly) incorrect.

Knowing someone who is a regular binge-abuser of alcohol, they just don't drink (for many days) before blood tests - their ranges go down.

You guys don't seem to care about the extreme market differences that may prevail in a culture where nobody is even supposed to be drinking.

Certainly a binge-abuser can get a hold of alcohol on the black market at a certain price, but in general, if Islam is established somewhere such that the corner liquor stores don't carry liquor at all, how many people will be alcoholics on the D.L. anyway?

If alcohol can't be had on the market under normal circumstances, is it not reasonable and rational to presume that most subjects would not be clandestine binge-alcoholics who hide it so well that weekly testing won't catch it? I mean, really.

What is the exact proposal here? Since the liver metabolises alcohol so quickly, and since these studies would follow a cohort over many months, you'd need to test the participants very frequently to catch moderate drinking.

I mean, sure, you can administer a breathaliser when they walk into their monthly appointment with the staff who're surveying them, but that's hardly going to detect a glass of wine they had last Saturday.