Anti-Laser Detectors are what drivers use to warn of oncoming police hunting for speeders.

Original laser detectors had short ranges less than .25 miles. The laser detector becomes less accurate as the distance increases since the light path widens from a pencil width beam to over 3 feet in diameter.

Light pulses from police laser detectors aren't detectible with standard radar detecting equipment, so driver detection of police lasers was developed fast. The original laser detector's limitations were almost like starting over in the 1950's with similar radar detector limitations.

Laser detector guns, just like original radar detectors, may not be used in moving vehicles. That may be an archaic limitation, but laser detectors have increased detection response by operating in the 90 GHz range, much higher than Super-Wide Ka-Band radar detectors.

Two industries spawned:Police radar and laser detection guns verified speeding drivers.Driver "anti" radar and laser detection devices warned of nearby police detection use.

Industry needed to advance.

As police obtained more sophisticated speed detection devices, so too did the anti-detection market develop.