Even if you are not intoxicated and you are under the age of 21 have any detectable amount of alcohol in your system operating a motor vehicle you may be charged with?

DUI. You would have a problem. Any alcohol in your system can get a DUI and the fact you are underage is another offense. If there is no drivers license add another check, but with a DUI most likely you will get a suspension on the license. Interesting fact is that most people don't think they are intoxicated when they are pulled over, but the breath test is proof they are. One beer or one wine will show intoxicated.