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If you are not under arrest by an officer, they can not detain you.
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No. See Terry v. Ohio, 392 U.S. 1, 88 S. Ct. 1968 (1967).
http://www.soc.umn.edu/~samaha/cases...0v%20ohio.html
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Bottom line: they cannot unreasonably detain you. A few minutes of non-cooperation and "I'm not talking to you without a lawyer present" and repeatedly asking "am I being detained, or am I free to leave now?" would get the point across.