When you understand the law and use your knowledge of it, you aren't being an <img src="/forums/images/graemlins/butwiggle.gif" alt="" />, yes you have the tendency to be viewed as such and risk being arrested on a trumped up charge, however, you shouldn't let Law enforcement officers do more than they are allowed to by law. We all know the types I am referring to, i.e., "I have a badge and a gun you must obey me", the ones that think they gain respect/power just by becoming a cop. These are the types I like to screw with. It is rather funny when you cut them down a peg or two when you can ask the right legal questions or when you inform them of their jurisdictional limitations. Of course most Law enforcement officers aren't like this and shouldn't be treated like they are. However even if they are this type when driving you are under a different set of conditions then when walking around in public. A drivers license is a conditional use permit and one of the conditions of its use is to answer questions when stopped by law enforcement. If he felt he was being targeted unfairly because of his ethnicity, or that the checkpoint was unconstitutional(IMO they all are regardless of the reason/season) he should have just taped the encounter, complied respectively, and then contacted an attorney. Challenging the validity of the checkpoint with low level agents wouldn't get him anywhere, and gives it the look of being staged.