Idaho Code § 19-621

The duly elected or appointed sheriffs, state policemen or policemen of cities of the first or second class of the state of Idaho are hereby authorized to establish, in their respective or adjacent jurisdictions, temporary road blocks upon the highways of this state or city streets for the purpose of apprehending persons reasonably believed by such officers to be wanted for violation of the laws of this state, of any other state, or of the United States, and using such highways or streets.