Aren't you always allowed to refuse to be breathalyzed? This even applies if you're operating a vehicle recklessly and the officer pulls you over while you have a 40 in your hand. (In that situation, the officer can still arrest you, but you'll be given the more accurate blood test at the station.)
However, if you're just at party, I think the testing is simply out of question. Also, unless your state has stop and identify laws, you wouldn't have to identify yourself and show that you're 21 or older either.
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