That’s what the DHS is trying to argue, but the facts of the matter demonstrate otherwise.
Carting him off to the courthouse takes this from detention into the realm of arrest.
prove it.
Dunaway v New York 1979
We first consider whether the Rochester police violated the Fourth and Fourteenth Amendments when, without probable cause to arrest, they took petitioner into custody, transported him to the police station, and detained him there for interrogation.
The Fourth Amendment, applicable to the States through the Fourteenth Amendment,
Mapp v. Ohio,367 U. S. 643 (1961), provides:
"The right of the people to be secure in their persons . . . against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue but upon probable cause. . . ."
There can be little doubt that petitioner was "seized" in the Fourth Amendment sense when he was taken involuntarily to the police station.