Roadblocks have been found to be constitutional if their purpose is to check for dr-unk drivers.
It is acceptable to put up and run a roadblock for border security, but it is not acceptable for crime prevention in general.
Roadblocks must be installed in order to fulfill a certain function that is strongly tied to a problem with automobiles and their movement.
For instance, the U.S. Supreme Court previously declared that a system of automobile checkpoints intended to "interdict" the use of illegal substances was unconstitutional.
The Court's decision was supported by the finding that the checkpoint program's main goal was "indistinguishable from the broader interest in crime control."
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