Did you know that when you're stopped for no reason at a drunk driving checkpoint – well, stopped for no reason having anything to do with something you did to suggest you might be "drunk" – your refusal to participate in self-incrimination can result in your arrest, loss of your government permission slip to travel as well as the impounding of your car?
Your "cooperation" is not only appreciated – it is required.
This not-much-discussed aspect of Checkpoint USA is arguably even worse than the existence of Checkpoint USA – which came into being in the '80s, when the government decided to re-interpret the limits of its own authority (a problem with government) by summarily decreeing it to be "reasonable" to randomly and arbitrarily stop people and treat them as presumptively guilty of having committed a crime.
The thing George Mason and others who insisted on the Bill of Rights as their condition for reluctantly supporting the dodgy Constitution (which was confected by an elitist minority, behind closed doors and without any mandate from "the people" mentioned in the Declaration of Independence) feared would come to pass had come to pass.
Despite the Bill and its very lucid delineation of the the lines across which the government has no rightful authority to tread, the government simply "interpreted" the line more to its liking – at its pleasure.
The government became the arbiter of its own power almost as soon as the ink on the Constitution dried – limiting first freedom of speech (Alien & Sedition acts) and many other formerly sacrosanct rights of the people – including freedom of association and the freedom to actually own property – during the ensuing years.
In the '80s, it cast aside the Bill of Rights' very clear prohibition of unreasonable searches – which by any etymological standard encompasses the arbitrary and random searching of everyone who just happens to be available.
But it's not just being forced to stop without your having given reason to warrant it – or forced to submit to a search just because the government is powerful and you are not.
In many states, there is the additional requirement in law that, if ordered to do so by an armed government worker, you must perform gymnastics by the side of the road to demonstrate you are not "drunk." Or breathe into a notoriously inaccurate device which provides evidence that can and will be used against you.