Editing Stanford prison experiment (section)

===Sunday, August 15: Day 1===
[[File:SPE1971-arrest-of-prisoner-8612.jpg|thumb|Arrest of prisoners|alt=Photo of a person being arrested in the street by a policeman. The policeman is fixing the person's arms behind his back and pushing him towards a police car. One person kneeling at the side of the car is taking pictures. Two children in the foreground are watching the scene.]]

The participants who had been assigned a prisoner role were mock-arrested by the local [[Palo Alto]] police at their homes or assigned sites.<ref name=":4" />{{rp|2–5}} The participants were intentionally not informed that they would be arrested, as the researchers wanted it to come as a surprise.<ref name=":0" /> This was a breach of the ethics of Zimbardo's own contract that all of the participants had signed.<ref name=":0" /> The arrest involved charging them with armed robbery and burglary, Penal Codes 211 and 459, respectively. The Palo Alto police department assisted Zimbardo's team with the simulated arrests and performed full booking procedures on the prisoners at the Palo Alto City police headquarters, which included warning of Miranda rights, [[fingerprint]]ing, and taking of [[mug shot]]s. All of these actions were video-documented by a local San Francisco television station reporter using Zimbardo's car. Meanwhile, three guards prepared for the arrival of the inmates. The prisoners were then transported to the mock prison from the police station, sirens wailing. In the "Stanford County Jail" they were systematically [[strip search]]ed and given their new identities (inmate identification number) and uniform.<ref name=":4"/>{{rp|2–5}}

Prisoners wore uncomfortable, ill-fitting smocks without any underwear and stocking caps, as well as a chain around one ankle. Guards were instructed to call prisoners by their assigned numbers, sewn on their uniforms, instead of by name, thereby dehumanizing prisoners. The prisoners were then greeted by the warden, who conveyed the seriousness of their offence and their new status as prisoners. With the rules of the prison presented to them, the inmates retired to their cells for the rest of the first day of the experiment.<ref name=":4" />{{rp|2–5}}