Idaho Code § 40-2311: Penalty for defacing or destroying signs, signposts or facilities.

It shall be unlawful for any person to deface or destroy any signs, signposts, guideposts, or any inscription on them, or facilities erected by or under the direction of the board, a director of highways, county, or highway district commissioners. Any person found guilty shall be deemed guilty of a misdemeanor. The defacing or destroying of each sign, signpost, guidepost, or inscription, or facility shall constitute a separate offense.