Abstract: An exemplary central system is configured to receive and store data from a registered device passing through an entryway of a restricted site, in a manner that permits the detection of unauthorized entry into the restricted site. A beacon broadcasts a beacon signal which prompts the registered device to transmit an active device ID and an active location ID to the central system, a sensor detects movement approaching the entryway and notifies the central system, and a camera captures an image of a region encompassing the entryway. The central system is configured to, among other things, receive the notification, communicate a control signal to the camera to capture the image, receive and store the image from the camera, cross-reference the active location ID with a registered location ID, and cross-reference the active device ID with registered device IDs. The entryway may have a barrier or may be barrierless.