that stuff only masks against flash photography, radar can be bounced of any part of the vehicle, it's laser that needs the plate and they don't use laser anymore or very little, plus gatso cameras need flash to take a pic but truvelo cams don't, i have a snooper radar laser detector in the car that uses GPS as well as a sensor on it to tell me if theres a gun being pointed at me, best thing to do is know your rights when it comes to them trying to give you a ticket, 9 times out of 10 they are obtaining money from you illegally as they are banking on you holding your hands up, not knowing the rules in which they need to work and just handing them the money
if they are using side of the road devices they need to be in a calibrated van or if out of the vehicle they need to be using a tripod NOT holding in the arm as a mm in movement can be 5mph in speed, if there are vehicles other than the target in the field of view they can't definitively say it was you doing the said speed, if the weather is not dry and clear then the reading could have been affected, if they are using hand held devices then there needs to be 2 officers present and the said officers should have calibrated the instrument the morning they went out to use it and they should have signed off on it, the vehicle in which they went out in to calibrate the gun needs to have a certificate to say the speedo is calibrated as they check the gun with the car before pointing at the public, if you ever see them pointing at you and you want to go and check they are doing it right you have the legal right to ask for the correct documentation, also despite if they are in uniform or a marked vehicle they MUST have their warrant card on them, if they are not carrying it you can walk away as they are as good as a member of the public without it, and if you ask for it they are required by law to show it to you