Without knowing the full details as to how the officer came to pull you over it is difficult to assess whether or not you should challenge it. IF the stop was without reasonable suspicion then you may want to challenge it. Just because a person blows over the legal limit doesnt mean they are guilty of DUI. IF the police officer pulls the person over without any reason for doing so the results of the Breathalyzer could be suppressed and thus the charge for DUI goes with it as well. Being that you are underage any amount of alcohol registered is a per se violation. It doesnt matter that you were under the legal limit for adults. As a minor the legal limit is Zero. If the cop pulled you over without citing you for any other traffic violations (speeding, Reckless driving, failing to come a complete stop....) then you might want to run it past an attorney to see what your options are for the state you live in.