I keep seeing a bunch of US Citizens posting here about issues they have with CBP/DHS on re-entering the US. Just a quick note + a link - you are protected by the fifth amendment and are not required to say a word to any officer at any time. You are NOT protected by the 4th amendment at the border and your consent is not required for any search.

http://nomadlaw.com/2010/09/more-law-refusing-answer-questio...