Vehicles may be fitted with special sensors to monitor the air in urban areas for “harmless” substances as a matter of routine or to check for deviations from normal patterns. If in the street there is suddenly the smell of acetone, this may detect the presence of a home made bomb laboratory.
Other sensors & devices which are currently used internationally on law enforcement vehicles include:
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Body worn sensors (GPS) to enable the location of personnel at any time.
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Unobtrusive Mobile Motion sensors and Trip Wire sensors which can be deployed in doorways and under vehicles to monitor ingress/egress points and vehicle movement, in addition to protecting officers from ambush during surveillance details.
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Infra red Night Vision cameras - people and vehicles show as high-contrast targets against a dark background, even covert intruders who may be hiding in shrubbery or in shadows. Suspects are unaware of being recorded.
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Biometric identification sensors which can be linked to central databases.
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Tail Gauge sensors - on police, fire brigade and rescue vehicles in order to help lessen and prevent accidents as vehicles are manoeuvred in and out of dangerous situations.
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