are there exceptions?
Yes,  In "United States v. Martinez-Fuerte" (1976), the Supreme Court allowed discretionless immigration checkpoints. In "Michigan Dept. of State Police v. Sitz" (1990), the Supreme Court allowed discretionless sobriety checkpoints. In "Illinois v. Lidster" (2004), the Supreme Court allowed focused informational checkpoints.
Fourth Amendment to the United States Constitution
 In "United States v. Martinez-Fuerte" (1976), the Supreme Court allowed discretionless immigration checkpoints. In "Michigan Dept. of State Police v. Sitz" (1990), the Supreme Court allowed discretionless sobriety checkpoints. In "Illinois v. Lidster" (2004), the Supreme Court allowed focused informational checkpoints.
what is the fourth amendment to the united states constitution? It is a part of the Bill of Rights. It prohibits unreasonable searches and seizures. when was it introduced? 1914 do you know by whom? UNANSWERABLE
wiki:19623221
Fourth Amendment to the United States Constitution [SEP] Exceptions
In "United States v. Martinez-Fuerte" (1976), the Supreme Court allowed discretionless immigration checkpoints. In "Michigan Dept. of State Police v. Sitz" (1990), the Supreme Court allowed discretionless sobriety checkpoints. In "Illinois v. Lidster" (2004), the Supreme Court allowed focused informational checkpoints. However, in "City of Indianapolis v. Edmond" (2000), the Supreme Court ruled that discretionary checkpoints or general crime-fighting checkpoints are not allowed.