Where do you find the authority to board and search within a reasonable distance 100 miles from the border?

• A. Investigative Terry detention
• B. Immigration checkpoint
• C. Investigative Terry detention, immigration checkpoint, arrest in public, port of entry and border seizure
• D. Port of entry and border seizure

Answer: (C)

Within 100 miles of the border, boarding and searching people or vehicles isn’t tied to a single rule. It comes from several enforcement authorities that together cover the different ways officers may stop, detain, and search in that zone. The strongest answer reflects all the applicable mechanisms: investigative Terry detention (stopping someone on suspicion and briefly detaining them), immigration checkpoints (vehicle stops at checkpoints for inspection), arrest in public (authorizing detention or arrest of individuals encountered in public), and actions at ports of entry and border seizures (searches and seizures conducted at actual ports or along the border). Taken together, these authorities provide the legal basis to board and search within the 100-mile border zone.

The other choices are narrower. Focusing on only investigative Terry detention or only a port-of-entry/border-seizure authority doesn’t capture the full spectrum of situations where boarding and searching may occur within that zone, which is why the comprehensive combination is the best answer.