A laser jammer is an electronic device used by drivers to prevent law enforcement officers from obtaining speed readings with a LIDAR (or 'laser) gun.

Laser jammers are not to be confused with radar jammers.

A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun.

Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding.

Only doppler radar-based devices can be detected — other speed measuring devices including those using ANPR, piezo sensors, and VASCAR technology cannot be detected.

LIDAR devices require a different type of sensor, although many modern detectors include LIDAR sensors.

Most of today's radar detectors detect signals across a variety of wavelength bands: usually X, K, and Ka.

In Europe the Ku band is common as well.

A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source.

The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF).

Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately, using two or more measurements of known transmitters, the location of a vehicle can be determined.

RDF is widely used as a radio navigation system, especially with boats and aircraft.

Radar jamming and deception (electronic countermeasures) is the intentional emission of radio frequency signals to interfere with the operation of a radar by saturating its receiver with noise or false information.

There are two types of radar jamming: Mechanical and Electronic jamming.

A police force is a constituted body of persons empowered by the state to enforce the law, protect property, and limit civil disorder.

Their powers include the legitimized use of force.

The term is most commonly associated with police services of a sovereign state that are authorized to exercise the police power of that state within a defined legal or territorial area of responsibility.

Police forces are often defined as being separate from military or other organizations involved in the defense of the state against foreign aggressors; however, gendarmerie are military units charged with civil policing.