A port of entry is legal defined as place designated port of entry means a port or place designated by the DHS (Department of Homeland Security) at which an alien may apply to DHS for admission into the United States. A POE is normally overseen by the Customs and Border Protection.
POE And Inspection and Admission
This is the rule of law in the United States and the right of a soveriegn power to control its borders. All people coming into the United States from another nation must pass through a POE. The laws give the CBP extreme powers to inspect and admit people to the United States. Right to Counsel is non-existence and so are many the constitutional protections. A POE although on American soil really is like no man's land" in so far as many of the legal protections afforded to people are unavailable largely so to permit the CBP officers to perform their jobs and keep America's borders safe.