A modular conveyor apparatus includes a plurality of substantially identical conveyor segments. A test administration unit, an audio-visual data collection unit, and an audio-visual data processing unit are configured to detect testing anomaly events within the testing environment by analyzing audiovisual data from the test subject and environment itself. The system may securely authenticate, admit, process, profile, aggregate and archive information inputted directly by the client at the merchant’s place of business, or in advance of the client’s arrival to the merchant’s place of business. A second signal line connects the first gate low voltage and dummy lines, is insulated from, and crosses the gate lines outside the display area.