From
http://usgovinfo.about.com/cs/mirand.../mirandaqa.htm
Quote:
Q. Can police arrest or detain a person without reading them their Miranda rights?
A. Yes, but until the person has been informed of his or her Miranda rights, any statements made by them during interrogation may be ruled inadmissible in court
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Basically, anything your friend said is inadmissable in court. But, if they found pot in his pocket, or whatever, then they don't need anything from him really. They already have their evidence.