Actually, the GPS is one of the main reasons people get pulled over.
air fresheners
oil change stickers
e-zpass tag
gps
edit: forgot about hood scoops.
Basically, the laws are pretty specific, but the police issue a ticket for anything in between you and the windshield, and say "obstruction of vision" and issue you a citation. I guess they figure most people won't bother fighting it and say "oh well, I did have x up there".
If you read the actual law, it is probably something like "thou shalt not have any non-transparent material upon thy windshield", which is what i'm arguing, there was nothing UPON my windshield. I'm sure the intent of the law was to prevent morons from driving while doing something stupid like having tinted windshield or snowed over windshield, or whatever. In fact, it usually accompanies, "must have working windshield cleaning device designed to be operated by driver from within vehicle."
So, me being one of those guys that always thought "this sort of thing never happens, cops are good people" happened to get a reality check that those DUI checkpoints aren't good to go through, even when you've done nothing wrong.
Pisses me off that this is the sort of thing that breeds mistrust between the public and law enforcement. As if there isn't enough seriously bad stuff that has happened between cops and civies, let's take those "we're out here for your safety" things and use them as fundraisers by becoming predatory on innocent people.
F'n cowards can't actually go out and find the morons who's driving skills make death reality on the roads, too bad good driving civilians seem to find them every mile or so.
What really pisses me off is that I found a decision where the courts let 2 guys go when they were caught with 5 pounds of weed, a few guns, $9K and some other crap in their car, because the search was illegal based on the officer's initial cause for stopping the vehicle. Incompetant police work put 2 bad guys back on the street. Reason he stopped the vehicle? "On foot patrol, I observed that the driver's vision was obstructed by a little tree air freshener hanging from the rear view mirror."
Every time a cop does something this stupid, they should make him or her go on patrol without a sidearm for a week. It might stress the importance of public opinion and infuse the principles of courtesy, professionalism, and respect. If they want to play around like children, treat them like little kids.