Negligent Security Expert Witness

Negligent security cases ask a property owner to answer for a crime someone else committed. That makes them different from ordinary premises liability, and harder. The plaintiff has to establish that the criminal act was foreseeable, that the security measures in place fell below what a reasonable owner would have provided, and that adequate measures would have prevented or reduced the harm. Expert testimony carries all three.

These claims arise most often at apartment complexes, hotels and motels, parking garages and lots, bars and nightclubs, shopping centers, and office buildings, typically after an assault, shooting, robbery, or sexual assault on the property. Related premises matters may also involve premises liability and security expertise.

Foreseeability is the threshold question

Before the adequacy of security matters at all, the plaintiff has to get past foreseeability, and jurisdictions take meaningfully different approaches to it.

Some states apply a prior similar incidents test, requiring evidence of comparable crimes on or near the property. Others apply a totality of the circumstances test, which considers the property's condition, location, nature of the business, and the broader crime environment along with prior incidents. A few use a balancing approach weighing foreseeability against the burden of protective measures. Florida, Georgia, Texas, and California have each developed distinct bodies of law here, and the applicable standard determines what the expert needs to prove.

The evidence usually comes from a crime history analysis. Experts pull calls for service and incident data for the property and the surrounding area, compare crime rates against local and national benchmarks, and identify prior incidents of the same type. Sources include police department call records, CAP Index or similar risk scoring, the property's own incident reports and security logs, tenant complaints, and in some cases prior litigation against the same owner.

The defense counters that prior incidents were dissimilar, that the area crime rate is unremarkable, or that the specific act was random and unpredictable. Those arguments are strongest when the plaintiff's expert relies on general area crime statistics without property-specific data.

What the security expert evaluates

Once foreseeability is established, the analysis turns to what the owner did and what a reasonable owner in the same position would have done.

Physical security covers lighting levels and coverage, which is one of the most common deficiencies and one of the few that can be objectively measured with photometric readings. It also covers perimeter fencing and gates, access control at building entries, door and lock hardware, window security, and landscaping that creates concealment or blocks sight lines. Crime Prevention Through Environmental Design principles, particularly natural surveillance, access control, and territorial reinforcement, provide the framework most experts use. Visibility and detection issues often also overlap with human factors analysis.

Electronic security covers camera placement, coverage, image quality, recording retention, and whether anyone was actually monitoring. A system that recorded nothing usable, or that had been broken for months, is frequently the centerpiece of a case.

Personnel security covers whether guards were provided, their number and deployment, post orders, training, supervision, patrol documentation, and response procedures. Where a contract guard firm was involved, the analysis extends to the contract scope and whether the firm performed it.

Management practices cover incident reporting, response to tenant complaints, background screening where applicable, key control, and whether the owner conducted any security assessment at all.

Causation, which is where many of these cases fail

Establishing inadequate security is not enough. The plaintiff has to show that reasonable measures would have prevented or mitigated the harm, and this is where defense counsel focuses. A working camera does not stop an assault. A gate does not exclude a resident's guest. If the assailant was an invited visitor, or the crime occurred in seconds, the causation argument gets difficult regardless of how poor the security was.

Experts handle this through deterrence and opportunity analysis, addressing how the specific deficiencies enabled the specific crime: an unlit stairwell that allowed an attacker to wait unseen, a broken gate that provided access, an unmonitored entry that let someone follow a resident inside. Testimony that stays tied to the mechanics of this crime holds up better than general claims about deterrence.

Qualifications to look for

Backgrounds vary widely in this field, which makes vetting more important than in most specialties.

Former law enforcement with crime prevention or investigative experience is common, and credible when paired with security management practice. Corporate and hospitality security directors bring standards-of-practice knowledge specific to the property type. Board Certified Protection Professional (CPP) certification through ASIS International is the most widely recognized credential, with PSP for physical security specifically. Some experts come from academic backgrounds in criminology or security management.

Property type experience matters. Hotel security practice differs from multifamily residential, which differs from retail and from nightlife venues. An expert who has never worked in the relevant sector is vulnerable.

Be cautious with experts whose entire methodology is personal experience. This specialty draws Daubert challenges, and opinions grounded in published standards, industry practice, measurable data, and documented crime analysis survive better than opinions grounded in a career. For how qualification attaches to the specific opinion, see qualifying an expert witness.

Site inspection and timing

Conditions change fast in these cases. Lights get repaired, cameras get replaced, gates get fixed, landscaping gets cut back, and guards get added after an incident, sometimes within days. A site inspection while conditions approximate what existed at the time of the crime is often the single most valuable step in the case, and photometric lighting measurements taken at the same hour as the incident are difficult for the defense to rebut.

Subsequent remedial measures are generally inadmissible to prove negligence, but their existence tells the expert what the deficiency was, and they may be admissible for other purposes depending on the jurisdiction.

Fee expectations

Security experts generally charge $250 to $500 an hour for review and report work, with higher deposition and trial rates and frequent half day or full day minimums. Crime data analysis, site inspection with lighting measurement, and travel add meaningfully to the total. Full engagements through trial commonly run $10,000 to $30,000, with complex commercial properties and multi-incident histories running higher.

Frequently asked questions

How many prior incidents are needed to establish foreseeability?

There is no fixed number, and in totality of the circumstances jurisdictions the answer can be zero if other factors are strong enough. In prior similar incidents states, the similarity and recency of the prior crimes matters more than the count.

Does having security guards defeat the claim?

No. The question becomes whether the number, deployment, training, and supervision were adequate, and whether the guards performed as their post orders required. Guard presence sometimes strengthens a claim by establishing the owner recognized the risk.

Is missing camera footage helpful to the plaintiff?

Often. Depending on the jurisdiction and the circumstances of the loss, it can support a spoliation argument or an adverse inference, and at minimum it undercuts the owner's account of what happened.

Can the same expert address both security adequacy and crime foreseeability?

Frequently yes, though some cases use a criminologist for the foreseeability analysis and a security practitioner for the adequacy analysis, particularly where the crime data work is extensive. For when that split is necessary, see when your case needs two expert witnesses.

When should the expert be retained?

As early as possible, because the site inspection loses value with every repair and upgrade, and because retention schedules for camera footage and call records are short.

Find a Negligent Security Expert Witness

Negligent security cases can involve foreseeability, crime history analysis, lighting, cameras, access control, guard adequacy, and causation after assault, robbery, or other violent crime on a property.

Blackstorm Experts helps attorneys identify negligent security expert witnesses whose property type experience and methodology match the venue's foreseeability standard and the security deficiencies at issue.

Start an expert witness search when you are ready to retain.