Mr. Wakatsuki was arrested and detained without a warrant, which amendment does this violate?

Fourth amendment

The Fourth Amendment (Amendment IV) to the United States Constitution is part of the Bill of Rights. It prohibits unreasonable searches and seizures. It requires reasonable governmental searches and seizures to be conducted only upon issuance of a warrant, judicially sanctioned by probable cause, supported by oath or affirmation, particularly describing the place to be searched and the persons or things to be seized.