License-plate spray foils traffic cameras

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Motorists have litigated against them, fired bullets at them and thrown garbage on them -- all to get back at the traffic cameras that have caught them in the act of running a red light or speeding.

Now they have a new weapon in their arsenal, and it comes in a can for $29.99. A clear spray called Photoblocker can be applied to license plates to make them hyper-reflective and unreadable when the camera flashes.

The product, marketed by online merchant Phantom Plate (www.phantomplate.com), defies laws that preclude motorists from placing covers over their license plates but have no provisions for a clear spray.

Joe Scott, the marketing director for Photoblocker, said he knows of no jurisdictions that ban the spray. Most states have laws against obscuring or distorting license plates, but Photoblocker obscures the license plate only in a photo, Mr. Scott said, making it legal or at least difficult for police to detect with the naked eye.

Capt. John Lamb of the Denver Police Department said a test of the spray proved effective at producing a glare over the license plate.

The District, Maryland and Virginia all have laws permitting the use of red-light cameras, and the Federal Highway Administration says 21 states have red-light or speed-detection cameras in place or are considering installing the devices.

Lt. Patrick Burke of the Metropolitan Police Department said the spray isn't banned by any laws in the District, but he has yet to see a spray that is effective.

The spray might slip through a loophole in state law, said Steve Kholer, a spokesman for the California Highway Patrol, who said he had not heard of the product. Citations in California can cost up to $275.

If the spray becomes a problem, Mr. Kholer said, the law will catch up with it.