Answer:
I can only think of one, sorry.
Say that there are two people- person A and person B.
Person A is in the early stage of alcoholism and person B is in the late stages of alcoholism. Both are not light weights. Give both of them the same number of beers, and see their reactions after finishing it. Person A will definitely be more drunk than person B. So, I guess, one way to tell that a person was in the early stages of alcoholism would be that they can't handle liquor that well compared to someone in the late stages of alcoholism.
Step-by-step explanation:
It's kinda like the saying "practice makes perfect." The more beers you drink, the more liquor you can handle.