How do Verified Alarms Catch Thieves?

Read the full story in our Commentary on the Vancouver Lighting break-in.

Why are Commercial and Industrial Buildings Like This an Attractive Target?

They sit empty overnight and are attractive precisely because nobody is expected to be listening. A lighting distributor’s warehouse holds inventory, tools, office equipment, even cash and its overnight hours give an intruder uninterrupted time to search offices, open cabinets, and move anything valuable toward an exit. What makes this incident instructive is not the building type. It is the intruder’s own reasoning. He assumed that if he stayed below the coverage area of a motion sensor, no system would know he was there. That reasoning holds for virtually every other alarm system. It does not hold for Sonitrol's. That assumption reveals how most business owners, and most intruders, think about alarm systems: as detection zones that can be mapped and avoided, rather than as environments that are built for deterrence.

Why Don’t Most Alarm Systems Detect Something Like This?

Virtually every other alarm system relies on passive infrared motion sensors and door or window contacts. Motion sensors are typically mounted at a height and angle designed to catch someone walking upright through a space, which means a person who crawls, stays low, or moves along the floor outside a sensor’s field of view can pass through a covered area without triggering anything. Door contacts only report that a door was opened, not what happens after. Even when a conventional system does trigger, it usually does not verify that it's in fact a break-in. It generates a signal that a monitoring centre can't interpret, so they call a keyholder or employee and ask them to drive to the property and confirm whether the alarm is real before anyone calls for a police response. That process takes too much time, and allows for the thieves to finish what they came to do. None of it happens in real time, and none of it accounts for an intruder who already knows how to stay under a motion sensor’s coverage.

Why Does the Verification Gap Matter?

The real cost of an unverified alarm is not the alarm itself. It is the time it buys the person inside the building. Every minute between entry and a verified response is a minute an intruder can spend searching desks and cabinets, locating a safe, or working out how to move it, undisturbed and unaware that anyone is watching. In a building with no live verification, that gap can run to many minutes, sometimes longer, before an employee even reaches the property to check. In this case, the same low-profile entry that would have gone unnoticed by a conventional system was picked up by Sonitrol’s audio sensors the moment it happened, and police were already en route while the intruder was still inside believing his approach was working.

How Does Verified Security Change the Response?

Verified security changes what police are told, and that changes how quickly they act. Sonitrol’s proprietary audio intrusion technology listens for the non-ambient sounds of an actual break-in and pairs that detection with live video from the facility’s integrated cameras, so a monitoring operator can see and describe what is happening in real time. That is why police respond Priority ONE to a Sonitrol-verified alarm: dispatchers are not guessing whether a signal is real, they are relaying a monitored, in-progress event. Sonitrol has logged more than 188,000 apprehensions since 1977 at Sonitrol-protected sites, and the documented average police response time to a verified alarm is 3.5 minutes. That speed exists because the information police receive is different. According to the U.S. Department of Justice, conventional unverified alarm systems generate a false-alarm rate of 94 to 98 percent industry-wide, which is why departments cannot treat every motion-sensor trip as a confirmed crime in progress. Toronto Police have reported a similarly high false-alarm rate, roughly 97 percent, for a Canadian data point. Sonitrol’s own false alarm rate sits under 3 percent, and that difference is what allows a verified call to move to the front of the queue instead of the back of it. For the incident that prompted this comparison, see how Vancouver Lighting’s verified alarm reached police in one minute.

What Practical Steps Should Property Owners Take?

Five practical steps make a meaningful difference for any commercial property that keeps valuable inventory, equipment, or cash on site.

Audit where your motion sensors actually cannot see. Most commercial motion sensors are installed to catch someone walking upright through a space. Have a security professional walk the floor at crawling height and check for gaps along walls, under shelving, and around large equipment where coverage may not reach.

Ask whether your alarm calls police or calls a person first. Many conventional systems route a triggered alarm to a monitoring centre that calls an employee or keyholder before anyone calls police. Find out exactly what your current provider does in the first five minutes after a trip, not just what the contract says it does.

Pair motion and contact detection with live audio or video verification. A system that can confirm an intrusion in real time, rather than simply recording it, is what allows a monitoring centre to give police actionable information instead of an ambiguous alert.

Secure high-value items away from easy sightlines and easy removal. Safes and cabinets that are anchored, positioned away from loading areas, or kept out of view from entry points buy additional time even before a system responds.

Review your after-hours monitoring plan with a professional, not just your equipment specifications. The hardware is only half the picture; how a triggered event actually reaches police, and how quickly, is the part most businesses have never had explained to them.

Book a free commercial security audit with Sonitrol Western Canada and find out whether your current system would have caught him, or just recorded him.