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Do you have to show your ID?
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It depends on the state you live in. Nevada has a law saying you do. It was challenged to the US Supreme Court and upheld. So, if you live in one of
these states you have to do what your state law requires. Read carefully, they may need to meet some 'reasonable suspicion' standard, and you might be able to simply state your name rather than produce a document. As always if you want your rights to be more than theoretical, it is best to have the complete encounter videotaped, unless that's considered wiretapping in your state.