Mutual Aid System

Law Enforcement

Click here to access the Mutual Aid Resource Database

Photo of Law Enforcement vehicle ​The Mutual Aid System is an extension of the concept of “neighbor helping neighbor.” The Law Enforcement Mutual Aid System was established in 1961, and has been used to restore order during emergencies, including civil unrest and to provide assistance to local agencies during other unusual events. As a component of the Standardized Emergency Management System [SEMS], the Mutual Aid System is based on four organizational levels: cities, counties, regions and the State. (A county is an operational area along with its political Subdivisions.) The state is divided into seven Law Enforcement Mutual Aid Regions. The County Sheriff is a key role player within the system and each Sheriff serves as the Regional Mutual Aid Coordinator.

The basic concept provides that within the operational area, adjacent or neighboring law enforcement agencies will assist each other. Should the event require assistance from outside the county, the region will provide requested assistance to the impacted county. If the combined resources of the region are insufficient to cope with the incident, the Regional Coordinator contacts the State Law Enforcement Mutual Aid Coordinator at CalOES. A similar plan exists for The County Coroners. The plan provides for coroner assistance from the local up to the federal level.

Planned events, such as concerts, parades, fairs, etc. are the responsibility of local agencies. Any requirement for additional public safety presence should be addressed through contractual arrangements. If any event, planned or spontaneous, appears that it may result in a request for mutual aid, or some other special resource, and early call to the CalOES Law Enforcement Branch is encouraged. A staff peace officer from the branch will usually be assigned to work directly with the jurisdiction to assist in plans development.



Blue Book: Law Enforcement Mutual Aid Plan Book_Law Enforcement Mutual Aid Plan.pdfBlue Book: Law Enforcement Mutual Aid PlanLEMA Documents12/30/2019 5:23:15 PM
Critical Incident Response Plan for First Responders Manual.docCritical Incident Response Plan for First RespondersLEMA Documents5/5/2016 9:43:46 PM
CLEMARS Plan Plan.pdfCLEMARS PlanAs an adjunct to effective mutual aid, the branch shares responsibility of the California Law Enforcement Mutual Aid Radio System [CLEMARS]. The CLEMARS Plan documents application for, and use of, the system.LEMA Documents6/17/2019 7:34:31 PM
Green Book - Search and Rescue Annex Book_LEMA Search and Rescue Annex.pdfGreen Book - Search and Rescue AnnexLEMA Documents6/2/2021 6:25:28 PM
LEMA Quick Reference Guide Quick Reference Guide.pdfLEMA Quick Reference GuideLEMA Documents9/3/2021 6:56:51 PM
Law Enforcement Reimbursement Process Enforcement Reimbursement Process.pdfLaw Enforcement Reimbursement ProcessLEMA Documents2/4/2020 4:59:29 PM
Red Book: Law Enforcement Guide to Emergency Operations Book ADA Compliant.pdfRed Book: Law Enforcement Guide to Emergency OperationsThe Law Enforcement Guide for Emergency Operations provides law enforcement agencies with a better understanding of the State’s Emergency Management System, ICS, and provides guidance with law enforcement response to major emergencies.LEMA Documents11/7/2019 5:56:21 PM


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