I know there are a few on here who have them...this chap seems to have had a lucky escape getting a suspended sentence.
http://www.dailymail.co.uk/news/article-4200016/Salesman-jammed-speed-cameras-laser.html
http://www.dailymail.co.uk/news/article-4200016/Salesman-jammed-speed-cameras-laser.html
Judge Andrew Stubbs QC warned that other motorists caught using the legal-to-buy blockers faced being sent straight to jail. He spoke out after being told there were four pending prosecutions for using the device – sold as a ‘parking sensor’ – in North Yorkshire alone.
The judge added: ‘I hope the message goes out from this court to everyone else that perverting the course of justice almost inevitably leads to a custodial sentence.’