[0] “They did take them to an area that was safe for both the officers and the individual to do the questioning,” he said. “It’s not a custodial arrest. We need to question this individual to find out what their role was in this laser-pointing.”

Eventually, Cline said, the protester was released “because [DHS] did not have what they needed.”

[1] In Dunaway v. New York the Supreme Court considered whether police violated the Fourth and 14th Amendments when–lacking probable cause–they took a person into custody, transported him to a police station and detained him for interrogation. Once again, six justices found that police violated the U.S. Constitution with such actions.

Per that landmark case: [T]he detention of petitioner was in important respects indistinguishable from a traditional arrest. Petitioner was not questioned briefly where he was found. Instead, he was taken from a neighbor’s home to a police car, transported to a police station, and placed in an interrogation room.

[2] https://lawandcrime.com/legal-analysis/two-dhs-officials-app...