“However, the detention of a person need not be accompanied by formal words of arrest or a station house booking to constitute an arrest.”
What the hell are you linking to if you don’t read your own link.
The test used to determine whether an arrest took place in a particular case is objective, and it turns on whether a reasonable person under these circumstances would believe he or she was restrained or free to go. A reasonable person is one who is not guilty of criminal conduct, overly apprehensive, or insensitive to the seriousness of the circumstances. Reasonableness is not determined in light of a defendant’s subjective knowledge or fears. The subjective intent of the police is also normally irrelevant to a court’s determination whether an arrest occurred, unless the officer makes that intent known. Thus, a defendant’s presence at a police station by consent does not become an arrest solely by virtue of an officer’s subjective view that the defendant is not free to leave, absent an act indicating an intention to take the defendant into custody.
An arrest constitutes a seizure under the Fourth Amendment to the U.S. Constitution, and thus the procedures by which a person is arrested must comply with the protections guaranteed by the Fourth Amendment or the arrest will be invalidated and any evidence seized during the arrest or confessions made after the arrest will typically be suppressed. The U.S. Supreme Court has ruled that arrests made without a valid arrest warrant based on Probable Cause are presumptively invalid under the Fourth Amendment.
Similarly, arrests made pursuant to a warrant that is later ruled defective may also be declared invalid, unless the officer in procuring the warrant and making the arrest acted in Good Faith.