Tailgating detection that catches the second person in real time
Tailgating detection from Alcatraz watches the doorway after every valid entry and flags a second person the moment they follow, with video captured at the door. Built into the same Rock X reader that performs sub-second facial authentication, it runs on the edge device and reports through your existing access control system via Wiegand or OSDP.
The breach your access control system cannot see
The most common physical breach is not a forged badge or a picked lock. It is a person walking through a door someone else opened. Card systems are structurally blind to it: the reader saw one credential, the panel logged one entry, and the second person simply does not exist in the record.
It usually is not even malicious. Someone holds the door out of politeness, a delivery follows a shift change, a visitor drafts behind a busy employee. But the log now says one authorized entry while two people are inside, and every downstream assumption, occupancy, accountability, audit, is quietly wrong.
Alcatraz makes the second person visible. The reader keeps watching after a valid entry, flags the follower in real time, and captures video at the door, so the invisible breach becomes an evidenced event.
How tailgating detection works
Rock X authenticates the enrolled person in under a second, then keeps monitoring the doorway as the door releases. If a second person crosses on that entry, the event fires in real time, with video captured at the door and the follower tied to the verified entry they rode in on.
Because detection runs on the same edge device as authentication, there is nothing extra to install, wire, or calibrate at the door. Events flow into Rock Cortex alongside every entry record, and the reader sits in line via Wiegand or OSDP with your existing panel, so alarms surface in the monitoring your team already watches. Facial authentication itself removes the other half of the problem: with the face as the credential, the person who used to borrow a badge now has no way through at all.
Tailgating vs piggybacking: know the difference
The two terms get used interchangeably, but they describe different failures. Tailgating is the unnoticed follower: someone slips through behind a valid entry without the authorized person realizing. Piggybacking is consensual: the authorized person knowingly holds the door for someone else, out of courtesy, habit, or pressure.
The distinction matters because they need different responses. Tailgating is an intrusion to be detected and investigated. Piggybacking is a culture problem to be measured and corrected, and it only gets corrected once it stops being invisible. Alcatraz detects both the same way, a second person crossing on one valid entry, and gives security teams the event data to tell which pattern they actually have, door by door.
Why security teams choose Alcatraz for tailgating detection
Detection at the moment of entry
The reader flags the follower the instant they cross, not in tomorrow's log review. Your SOC gets a live, actionable event tied to a specific verified entry, while the second person is still steps inside the boundary instead of long gone.
Covers the gap cards cannot see
Card systems log credentials and miss people; Alcatraz logs verified people and flags the extras. Every held door, polite follow, and drafting attempt becomes a detected, attributable event, closing the most common physical breach at its exact point of failure.
Evidence, not just an alarm
Video captured at the door turns every event into a case file: who entered legitimately, who followed, and when. Investigations start with facts, repeat piggybacking patterns become measurable, and audits see detection that demonstrably works rather than a policy statement.
Proof from the field
Data center leader deploys real-time tailgating analytics
A global data center operator adopted Alcatraz to replace legacy biometrics. Tailgating detection was a key driver, helping the company strengthen perimeter security and enforce compliance across multiple critical facilities.
Healthcare IT provider upgrades with tailgating alerts
A major healthcare technology company replaced legacy biometrics with Alcatraz for 2FA access. Tailgating detection was a key driver, providing greater visibility and security across critical data centers.
National bank strengthens branch access with tailgating detection
A leading financial institution selected Alcatraz to secure corporate sites with frictionless 2FA. Tailgating detection and real-time alerts helped the bank maintain compliance while simplifying access for employees.
FAQ
How does Alcatraz detect tailgating at a door?
Rock X authenticates the enrolled person in under a second, then keeps monitoring the doorway as the door releases, flagging any second person who crosses on that entry in real time and capturing video at the door. The event is tied to the verified entry it followed and surfaces through your existing monitoring.
What is the difference between tailgating and piggybacking in access control?
Tailgating is an unnoticed follower slipping through behind a valid entry; piggybacking is the authorized person knowingly holding the door for someone else. Alcatraz detects both as a second person crossing on one entry, and the event data shows security teams which pattern each door actually has.
Does tailgating detection capture video evidence?
Yes. Video is captured at the door the moment a second person is detected, tied to the verified entry they followed. Security gets a case file rather than a bare alarm: who entered legitimately, who followed, and when, which supports investigations, pattern analysis, and audit reporting.
Can tailgating detection work with my existing access control system?
Yes. Detection runs on the same Rock X reader that performs facial authentication, sitting in line via Wiegand or OSDP between the reader position and the panel, with platforms like Genetec, LenelS2, and Software House C•CURE unchanged. Events flow into Rock Cortex and your existing alarm monitoring.
Which doors benefit most from tailgating detection?
The doors where a second person matters most: data hall and cage boundaries, SIDA and secure airport doors, hospital units and pharmacies, residence hall entrances, and back-of-house corridors and cash rooms. Start where your incident reports or audit findings already point, then extend on the same platform.
See every entry, including the ones you were missing
Your access logs are only as honest as the doorway after the beep. Alcatraz makes them complete: every entry a verified person, every follower a flagged, video-documented event, on the panel and monitoring you already run. Start with the doors your last audit or incident review named, and find out what your logs have been leaving out.