<P> At any time, police may approach a person and ask questions . The objective may simply be a friendly conversation; however, the police also may suspect involvement in a crime, but lack "specific and articulable facts" that would justify a detention or arrest, and hope to obtain these facts from the questioning . The person approached is not required to identify himself or answer any other questions, and may leave at any time . Police are not usually required to tell a person that he is free to decline to answer questions and go about his business; however, a person can usually determine whether the interaction is consensual by asking, "Am I free to go?" </P> <P> A person is detained when circumstances are such that a reasonable person would believe he is not free to leave . </P> <P> Police may briefly detain a person if they have reasonable suspicion that the person has committed, is committing, or is about to commit a crime . Many state laws explicitly grant this authority . In Terry v. Ohio, the U.S. Supreme Court established that police may conduct a limited search for weapons (known as a "frisk") if they reasonably suspect that the person to be detained may be armed and dangerous . </P> <P> Police may question a person detained in a Terry stop, but in general, the detainee is not required to answer . However, many states have "stop and identify" laws that explicitly require a person detained under the conditions of Terry to identify himself to police, and in some cases, provide additional information . </P>

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