On a related note, as reported by the Washington Post the other day: There was a bank robbery in suburban Wash. DC (Maryland) a couple of days ago, on a weekday morning. For 45 minutes, the police shut down the beltway (the major interstate highway here), holding up hundreds of thousands of commuters during rush hour. As they held traffic, police officers with guns drawn went from car to car ordering the occupants to "pop the trunk" as they hunted for the bank robbers. I saw in the Post a photo of one of the officers walking through traffic holding his assault rifle.
Apparently, it's also now okay for the police to conduct blanket searches on thousands of people without probable cause, with a display of lethal force. I wonder if even one person thought to tell them "No, you're not searching my car" or asked them to produce their search warrant. I doubt it.
But they did catch the (alleged) bank robbers, so I guess it's all good. That 4th amendment is probably overrated anyway.