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These are devices that jam/interfere with speed detection devices operated by police officers, thereby preventing them from taking a reading. These devices are unlawful and you could face prosecution for perverting the course of justice, which carries a maximum sentence of life imprisonment, or obstructing the police.

Warning devices
Devices that only provide information about camera site locations are lawful in the UK. However, note that if you go abroad even these types of detector may be unlawful. You will need check what the legislation is in country you are travelling to.

The government is considering legislation to make it unlawful to use other types of speed detectors but as yet nothing has been finalised.

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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.