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Dual Tech motion detectors use two different technologies in the same unit: passive infrared and microwave. These devices are designed to avoid false alarms since both technologies must detect motion before setting off the alarm. Photoelectric Sensors: These sensors project a beam of light across a hall or doorway to detect motion and are triggered when a person passing through interrupts the beam. Glass Break Detectors: Usually mounted near windows to detect the specific high frequency sound of glass being shattered. They are usually installed on a wall opposite or adjacent to the protected glass and are effective within about 15′ to 25′. Smoke and Heat Detectors: Detect smoke and heat.

Cooperation can reach significant proportions, as in the case of the Minneapolis Police Department's "SafeZone" program, which place private security officers downtown who now outnumber Minneapolis Police Department officers there 13 to 1.

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Perhaps the most notable security advancements to initialize within Westernization are found in the history of ancient Rome.

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