Actually, it may not be that clearcut, Antigone.
Were you a pedestrian stopped by the police, ba0603?
If you were a pedestrian stopped by the police, and the police required that you take a breathalyzer, then what the police did has been found to be unconstitutional. Without a search warrant, it is a violation of your 4th amendment rights to be forced to submit to a breathalyzer test.
If this situation happened to you, and you were either forced to give a breathalyzer or ticketed for your refusal to submit to a breathalyzer, then consult with a lawyer in your area. It is very possible that your MIP could be dismissed.