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 t

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.