From the information you have given and my understanding of it ( I may be wrong)
I am thinking that the police car was following you ( eg moving at about the same speed) if correct the device must have been used whilst the police vehicle was moving and by a passenger.
I have no idea what the local guidelines are for use of this device in the area where you were stopped, i suggest you do your own research and look for potential "breaches of the operating guidelines".
eg study the manufacturers operating instructions, imagine how these might apply to your circumstances.
www.northants.police.uk/sites/default/files/Operat...f
eg is a moving detection permitted ? or ONLY at a roadside check ?
eg do the airwave radio systems HAVE to be turned off during the use of this device ? ( to prevent false readings etc) remember there maybe more than one radio system in play a vehicle system and one for each officer. If they should have been turned off there should be proof of this somewhere in the case file eg a sentence in the evidence statement that says " The device was used in accordance with the manufacturers instructions"
Edited by KenC on 05/05/2018 at 10:45
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