Foreseeability drives the duty analysis
Negligent security claims generally allege that a property owner failed to take reasonable steps, such as adequate lighting, locks, or guard staffing, to protect people from foreseeable criminal acts by third parties.
In Ann M. v. Pacific Plaza Shopping Center, the California Supreme Court addressed how much prior similar criminal activity is required before a landowner's duty to provide guards can be triggered, emphasizing that the burden of a proposed security measure should be weighed against the degree of foreseeable harm.
In Delgado v. Trax Bar & Grill, the California Supreme Court later clarified that a heightened showing of prior similar incidents is not always required, particularly where imminent danger becomes apparent in the moment and a minimal response, such as calling police, would have been enough.
Together these cases illustrate that courts look closely at what was known or knowable before the incident, and at whether the specific security measure sought was proportionate to that known risk.
Key negligent security concepts
| Case or doctrine | What the court addressed | What it means for a working guard or client |
|---|---|---|
| Ann M. v. Pacific Plaza Shopping Center | How much prior crime is needed before hiring guards becomes a legal duty | Prior incident logs and crime data matter when scoping a security contract |
| Delgado v. Trax Bar & Grill | Whether minimal steps, like calling police during an escalating incident, can be required even without a strong prior-incident showing | Staff and guards should be trained to call police early when danger becomes apparent |
| Balancing test | Weighing the burden of a security measure against the foreseeable harm it would prevent | Contracts should document why a chosen staffing or technology level was considered adequate |
| Third-party criminal conduct | Liability of the property owner, not the criminal actor, for failing to take reasonable precautions | Security providers should keep records showing patrols, checks, and responses actually occurred |
What this means for security planning
- Keep documented crime and incident history for a property to support any staffing or coverage decisions
- Record patrol frequency, guard presence, and response times so the actual security posture can be demonstrated later
- Escalate visibly dangerous situations to police immediately rather than relying solely on guard presence
- Review lighting, access control, and camera coverage periodically as part of an ongoing risk assessment
Research and education only
This overview is for research and educational purposes about California premises liability concepts and is not legal advice. Summit Force Security Group is not a law firm and does not provide legal representation. Anyone evaluating a specific incident or liability question should consult a licensed California attorney.
Official sources & local data
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The services this applies to
- HOA & Community SecurityDedicated HOA security for gated communities, apartment blocks, and neighborhood associations — parking, noise, and after-hours enforcement.
- Retail & Shopping Center SecurityUniformed presence that reduces shrink, loitering, and vehicle break-ins across retail centers and parking lots.
- Warehouse & Industrial SecurityWarehouse security guards controlling docks, gates, driver check-in, and after-hours perimeter sweeps.