Viral detectors were built by Blackwatch to track down Mercer after his escape from Gentek. These detectors are usually installed around Military bases. Whenever there is a trace of Mercer's strain of the Blacklight virus, the detectors would flash yellow. As the game progress, they become more dense, cover larger areas, sound an alert faster, and become harder to sabotage. At close proximity to the virus, the detectors flash red and alert the Marines or Blackwatch soldiers stationed around. These detectors can also call in Strike teams during an alert.