DUI Cases - so you did not provide a breath sample (no blow)?

At Hanover Law, we defend a variety of criminal cases -- including DUI's. When it comes to drinking, it is not uncommon to have a client indicate they refused to do a breath test. I wanted to take a few moments today to discuss breath tests, and the requirements for testing. What happens if you don't blow into "the little tube", and how do you defend these cases?