According to the Supreme Court's opinion in U.S.v.Montoya de Hernandez,involving the detention of a traveler at the border,the standard of evidence necessary to detain a traveler at the border,beyond the scope of a routine custom search and inspection is:

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The Supreme Court in U.S. v. Montoya de Hernandez held that a person's brief detention at the border, beyond the scope of a routine customs search and inspection, only requires reasonable suspicion, which is less than probable cause. This is because the government's interest in preventing illegal entry and contraband at the border outweighs the minimal intrusion on the individual's privacy rights. Therefore, reasonable suspicion is the standard of evidence necessary to detain a traveler at the border.

According to the Supreme Court's Opinion in U