Under the Fourth Amendment,which of the following is not a valid purpose for setting up a roadblock?

Question

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The Fourth Amendment protects against unreasonable searches and seizures. While roadblocks for immigration enforcement, detecting drunk drivers, and checking for drivers' licenses and registration have been deemed permissible under certain conditions, the Supreme Court has ruled that roadblocks set up solely for the purpose of drug detection violate the Fourth Amendment.

Under the Fourth Amendment,which of the Following Is Not a Valid