SDCL § 31-28-23: Tampering, molesting, or interfering with markers, signs, or control devices--Violation as misdemeanor--Liability for costs.

No person may, without lawful authority, attempt or actually alter, deface, injure, knock down, remove, or in any manner molest or interfere with any official highway marker, sign, guide board, traffic-control device, interstate highway gate, or any railroad sign or signal, barrier, warning device, or sign erected in connection with highway maintenance or construction activities. A violation of this section is a Class 1 misdemeanor. Any person who violates this section is responsible for the cost of repairing or replacing such markers, signs, signals, barriers, or devices.