Informed consent was not given as the pt's were not fully briefed about the entire experiment for example they were not told that they would be arrested from their houses by a real police officer. Rights to withdraw were also comprimised this is because Zimbardo took the role of the Prison Warden so was in role and treated the pt's like real prisoners rather than pt's. This means that the study contained many ethical dilemmas.
However Zimbardo defends the ethics. The only deception involved was to do with the arrest at the beginning of the experiment.The pt's were not told this partly because final approval from the police wasn't given until minutes before the pt's decided to participate, and partly because Zimbardo wanted this to come as a surprize (to reduce demand characteristics) This means that the study can be seen as ethical.
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