If you know you are Fukt up and a definate DUI, refuse all tests and when you go to court they can't prove your BAC and you will only lose your license for a year wich you will probably be loosing it anyways and not to mention all the money it will cost. Thats what one of my copper buddies told me.
maybe a radio hoop car cop can't, but a DUI expert can tell just by looking at you, what your BAC is