I have seen a few of these videos of citizens refusing to accomodate federal or state agents at checkpoints. This video is a compilation of several of them. In it you see that by resisting the citizen is allowed to pass. That appears to mean that these check points rely on voluntary compliance. In the absence of acceding to their request some become belligerent.
The need for you to volunteer to a search or a detention is apparent in the questions the offices ask. They are all requests. They are confounded when they get non-compliance. If the citizen is patient and insistent he is allowed to continue.
Some of these agents appear to be professionals while others look like retards. This is going to be OK until non-compliance becomes widespread. Then they will have to either let everyone go or they will ratchet up the pressure.
It’s interesting how this has become a ‘We vs They’ discussion.