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No, it is not legal.

Any interference with the number plate to make it less easily distinguishable to the eye or would impair the making of a true photographic image is illegal. Although the spray does interfere with flash photography many of the speed cameras use Automatic Number Plate Recognition (ANPR) technology that uses infrared, thereby making the spray ineffective.

You could be liable for a substantial fine if you are found guilty of using such a spray.

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Answers in this FAQ section are provided by the 'Ask the Police' website. Produced by the Police National Legal Database (PNLD) team, 'Ask the Police' is an official police site approved by the National Police Chiefs Council (NPCC). All FAQ answers are © PNLD.