If you are refering to DUI checkpoints, yes they are federally constitutional, .
Of course, they are , They are also constitutional in Cuba and similar police states .
The bastards inside the DC beltway have completely obliterated , decimated, annulled the 4th Amendment.
Heil Hitler.
Hey lets not forget the bastiches in our own states and communities as well.
and those ladies in church that belong to MADD.