Of course refusing to allow them to search the car is probable cause enough for them to impound it and THEN get a search warrent on such grounds.Are you being sarcastic or do you seriously believe that this is true? Refusal to give up your Fourth Amendment right against unlawful search and seizure does NOT constitute grounds to search your car or your house or anything you own. If it was, the Fourth Amendment would be worthless. Neither is "suspicious behavior" grounds to obtain a search warrant.
inert as in Norm Mineta's brain ... make that the FAA
If they want to search your car, they will find reasoning that justifies their actions.
A decision handed down by the US Supreme Court pretty much gives the police the okay to search your vehicle with little to no real justification. Seems that being arrested for speeding is all they need to search your car.
I wish that was being sarcastic. Sadly, I'm just stating the reality of life in the US post 9/11.