The Fourth Amendment of the U.S. Constitution protects Americans from random and arbitrary stops and searches. According to the government, however, these basic constitutional principles do not apply fully at our borders. For example, at border crossings (also called "ports of entry"), federal authorities do not need a warrant or even suspicion of wrongdoing to justify conducting what courts have called a "routine search," such as searching luggage or a vehicle. This helps you understand your rights within the 100-mile border zone.​

Map of the U.S. showing the 100 mile border zone