<p>He, of course, can do anything he wants. Just because other people do it, doesn't mean he should. I would be very careful. Let's say he has a fake id, goes to the store to buy alcohol and the bored store manager decides to call the police. He gets arrested and found guilty of a crime. Bye, bye... you've just been deported (the INS is obliged by law to start removal procedures if they find out you've been convicted of a crime). Even if the INS doesn't find out, that conviction will come up later if you try to get a Green Card or apply for citizenship.</p>
<p>It might not be very common, and I don't mean to scare anyone, but it only has to happen once. If you're going to drink, drink responsibly.</p>