18. License plate recognition cameras
Many campus organizations use tag cameras to record the license plates of all vehicles entering their roadways and parking areas. While these can be useful tools to identify an aggressor after the fact, systems that will alert security personnel when the license plate of a known potential violator enters the campus can provide early warning for certain types of attacks. For example, if a campus employee has received death threats from her ex-husband and he attempts to enter the campus to act on the threat, security personnel can receive an alert as soon as his vehicle enters the campus.