[vkou]

Borders are civil liberty free zones, by design. As are warzones, places that have declared martial law, and prisons.

DUI testing is different. In many jurisdictions you do not have to submit to it, if you are fine with losing your driving privileges - which is not a criminal penalty.

I'm not super pleased about it, but there is typically a clear line - some voluntary behavior voids your liberties. Involuntary behavior generally should not.