Um the gibberish you cited only pertains to private, individual situations. This gives me good indication about how ill informed you are in general about many such matters.

This seems to be your modus operandi - ignore relevant facts and cite irrelevant fluff to avoid addressing the real issues. How about answering my question about the audio in the police dash cam?

A checkpoint is clearly different from any private encounter, and as such would have signs which would indicate "video and audio surveillance" is taking place.

People consent to being searched when they enter a checkpoint, and similar principle would apply to video / audio recordings.

Obviously there would have to be privacy considerations to these recordings, such as complete tracking and control to ensure none of it is used inappropriately or leaked, and if nothing unusual happens in 7 days, all recordings are deleted, etc etc...