well in ca, if you are underage, there are several different possibilities.
IF under 21, you can drive with up to .05 % bac without getting a DUI. You WILL however lose your license for a year MANDATORY if you have anything over a .00 You do not have to pay any fines and you do not get arrested. Your insurance will fuck you though. If you have over a .05 and you are under 21, then you will get a full blown DUI and have to pay the 1500 in fines in addition to taking all kinds of stupid aa courses and what not. Problem with being a minor here and getting the .05 or lower violation is that you don't go to a real court.. you have a dmv hearing. My roommate hired an amazing attorney, and he had almost NO effect on the dmv hearing, the license was revoked and now they have to appeal it to get it to a real court so that the attorney can have some real say in the matter. It's a real headache. O yah, and here, if you refuse the test, it is an automatic admission of guilt. It's part of the "oath" you take when you get a drivers license.