Well I was in an accident so my blood would have been drawn had I not, also lets say they did not. I refuse the field sobriety tests, and the Breathalyzer and lose my license for 6 months on the spot. They still video tape you at the police station. My lawyer requested anything they would be using at my trial as any lawyer would. They submitted the booking video as evidence. Me and my lawyer watched said video at her office. My speech was impaired, I was rambling on, and I could barely stand and would have fallen at least twice if I were not handcuffed to the wall (granted this was about 3 hours after my last drink, and 2 hours after the accident so it was about 2 o'clock in the morning and I was fairly tired at that point) No jury in the world would have seen that video and thought anything other than "this dude is hammered".
I knew I was toast. All they would have done is hit me with stiffer penalties had I chosen to fight it. In my particular case, I was screwed. There is always that chance, but that very slim hope I could have held on to would have resulted in a 9 month loss of license with very little chance of a hardship license for my job on top of all the other stuff I was levied with. (opposed to 2 1/2 months with a hardship license for 45 of those days) It was really a case where fighting would only make it worse. In my particular case I did what I did to get my case over with and start the penalty phase and they were pretty nice to me compared to a lot of people in my alcohol awareness classes who did fight it. It was a common trend in there that the people who owned up and accepted there punished were treated about 1/3rd as strictly, and paid a lot less once you factor in legal costs. I strongly believe it was because we took our punishment and moved forward.
I found those to be the advantages in blowing in the breathalyzer, especially if you are involved in an accident and they can take your blood