So, back to my original question. Has anyone personally gone through one of these roadblocks? Sounds like some may have.

I'm just curious what is all involved with it. ID required for all vehicle occupants, sniffing dogs?

The article states "agents usually ask drivers different types of questions to gauge their status in the U.S., including questions about citizenship."
I love to see some video of that. Hell, there are plenty of US citizens who don't know jack about their own country.