Idaho Code § 46-402
Members of the Idaho national guard ordered into active service of the state by any proper authority shall not be liable in any court of this state, either civil or criminal for any acts done by them in performance of their duty. When suit or proceedings shall be commenced in any court by any person against any officer of the national guard of this state, for any act done by such officer in his official capacity, in the discharge of any duty under this act; or against any person acting under the authority or order of any such officer, or by virtue of any warrant issued by him pursuant to law, the defendant may require the person prosecuting or instituting the suit or proceedings, to file security for the payment of costs that may be awarded to the defendant therein. In case the plaintiff shall be nonsuited or have a verdict or judgment rendered against him, the defendant shall recover treble costs.
Idaho Code § 46-402