The HLA provides and maintains Trespass Authorizations for member landowners, which allows a neighbor to report a trespass to the Sheriff on a parcel where the landowner is not present.
The Sheriff then can act on the report.
Without this authorization, the neighbor would have no legal ability to report a trespass on any property other than their own.
You can download the form, Trespass Authorization.pdf, found below. Fill out the form and send it to: Siskiyou County Sheriff's Office, ATTN: Donna Hamilton, 305 Butte Street, Yreka, CA 96097, with a copy to the HLA at P.O. Box 795, Mt. Shasta, CA 96067.