I don't think it is so far fetched (maybe the 1 mph over, but...), however, that's exactly why I would like it. If the other guy is in the wrong (more likely the case, since we are all graduates of the "Lake Wobegon School of Driving"), and this helps prove it, that's great. And if I am in the wrong, well it's not fair to the other guy for me to get by due to lack of evidence.
Yes, any 'tool' can be used against us. But that is what needs to be monitored, not the tool itself. Otherwise, we'd outlaw hammers and chainsaws and kitchen knives. I like security cameras, lots of bad guys getting caught. I'll take a reasonable invasion of my privacy if it is for a good cause.
Obviously, people can differ on where that line is drawn, but for me, as long as it doesn't impinge too much on my freedom to travel where I want (and security inspections can be considered a reasonable impingement/delay), I'm pretty much OK with it. Actually, I like it - I want me and my family to be safe. Maybe I get a little aggravated at the 'privacy all the time, anywhere, in all forms' crowd making it tougher for me to be safe?
-ERD50