In use for over forty years, red-light, speed, rail crossing, and toll cameras are finding a place in many US cities. Many jurisdictions around the world are using photo-enforcement to enforce traffic laws. For the past ten years many jurisdictions has tested various types of photo-enforcement. Even though the technology is stable, accurate, and cost effective, many jurisdictions unsure of local reactions have chosen to run pilot programs. Of course, not everyone likes this technology.
Many companies offer radar detection devices.
There are many others who see photo-enforcement as a business opportunity and want to profit from trying to defeat this technology. Of course radar detectors have been for sale for some time, but new products have been designed and are being sold to prevent cameras from recording a license plate. One maker claims that his product will cause the plate to be unreadable. Even some jurisdictions are not pleased with the results. Use is now restricted to roads with a speed limit of 30 miles per hour or less.