On so many levels.

I don't know the details, but based on the cops backing down, it seems like their checkpoints are of dubious legality. If so, then why pull this stuff? To get people angry?

If you can't enforce it, don't try - just generates anger and disrespect for the law.

Sorry.

but of course after the fact.
they only serve one purprose..to get people used to a "papers pls" mentality.

the snooping and searching is spreading.
TSA now searches passengers of buses and trains.

people are now reporting that border Patrol is stopping cars as far as 100 miles from the border.

People operating small boats and small planes entirely within US areas are asked to submit to searches.

Particularly in Texas, drivers are stopped by police and any large amounts of cash are simply taken, because the law now says they can do that. No charges, no arrest, and no return of money.

Incidents like this are easily found in the internet news ( not MSM of course) and via a simple search engine browse.