88 S.Ct. at 1879 n.16.
Though appellee was not formally arrested before he was taken to the police station, he nevertheless was told, "you have to come to homicide with us." (Emphasis added.) Whether he would have appeared voluntarily at the police station, given the choice, is entirely speculativehe had no choice. In many respects, appellee was treated more like a suspect than a mere witness. He was frisked before he was placed in the police car, and from the moment he arrived at headquarters, he was constantly guarded. He was not even allowed to go to the bathroom alone. Furthermore, his hands were tested to determine if he had fired a gun. In our view, although appellee's conduct at the station could otherwise be characterized as "cooperative," thesemen who matched a radio description, following a nearby robbery twenty-five minutes earlier. He transported them to the scene of the crime for identification, whereupon he arrested them. Before placing the suspects in the car, however, he conducted a Terry frisk. He patted a paper bag carried by one of the men, and admitted that he could tell at that point that the bag merely contained a camera. He nevertheless opened the bag and removed the camera. The court held that despite the unlawfulness of the seizure, the evidence could be admitted under the "inevitable discovery" doctrine, since the officer independently obtained probable cause to arrest the suspect moments later, and the camera certainly would have been discovered during the inevitable search incident to that lawful arrest. Id.