No, because such a stop would have no valid reason. A stop for DUI occurs when you are visibly incapable of safely operating the vehicle. The field sobriety check and BAC are supporting evidence for the observed unsafe driving behavior.
States have seat belt laws too. In Idaho, that doesn't constitute PC for a stop. It can only be considered if a stop occurred for another valid reason.
No, you are wrong. You can be stopped even without that. Does that change your opinion?
PS, read the link.
The breathalyzer test is, in fact, a DNA test. Try figuring out a way of no DNA being transferred to that tube you are blowing into...........
Yet another infringement problem.