Interesting article discusses how “license plate sprays” and other attempts to conceal license plate photographs are ineffective.
Some “masking” products let us apply a cover or spray to license plates to neutralize the devices. The spray or cover supposedly reflects the camera’s flash and overexposes the photo, rendering it useless. However, a new study of some of those products by the Los Angeles Police Department — experts on the “California stop” — shows they don’t work and, in some cases, actually improve the image quality.
“The countermeasures had no effect on plate legibility under dark conditions, with the exception of V-2 (license plate shield), which occasionally caused a slight increase in front-plate legibility in half of the images. … All rear plate images were clearly legible, with no significant difference between the test plate images and the control plate image. A citation could have been issued in all cases,” the study said.
Oh well. Back to the drawing board . . .