Like TSA "security" screenings at airports, highway checkpoints manned by agents of the Department of Homeland Security have less to do with keeping people safe than with conditioning people to submit without question. Fortunately, a few brave individuals show us that we are under no legal obligation to comply:
The comment from the DHS agent at the 9:45 mark sums up the government's attitude: "The normal person would allow us to run checks on their identification." In other words, if you have a problem with a government agent stopping and detaining you without probable cause, you aren't normal.
The fact that these agents eventually back off proves that they know full well they lack the authority to force people to comply. I hope more people follow the examples seen here.