Idaho Code § 18-7036

No person shall purposely or knowingly vandalize, deface or otherwise damage the property of another by painting, writing, drawing, or otherwise inscribing thereon in any fashion that which is commonly known as graffiti. Graffiti includes any form of painting, writing, or inscription regardless of the content or the nature of the materials used which is applied to any public or private surface without the consent of the owner of the property. Every person who is convicted of a violation of the provisions of this section is guilty of a misdemeanor.