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Were you speeding?
It is possible that another vehicle could have set off the device.
What you have to do really is decide how much risk you want to take. The reality is that although it is possible, it is quite unlikely that that would be the case. If you do fight this and lose then there would be a cost implication. If you need to avoid points to keep your licence then it may be worth putting them to proof as you need to avoid your licence at any cost.
If this is 82 miles an hour in a 70 miles an hour zone then you would only be facing three points and a fine-the fixed penalty.
If you thought this and lost then you would only be facing three points but the costs order could be a nasty shock.
That said, it might well be that they decide this is not in the public interest to prosecute. That does happen sometimes. People do get lucky but you are obviously taking a risk.
Can I clarify anything for you?
Just because they haven't sent them doesn't mean they don't exist. CPS is in chaos especially in the lower courts.
Truth is, they probably do because GATSOs work on that basis. They might lose them and you might be lucky but you should understand you are taking a risk.
They have to take two pictures because that is how a GATSO determines speed.
They do distinguish between vehicles though. Not vehicles per se but the spaces between them. They can tell which vehicle has set the device off although that is a matter for expert evidence.
It seems to me they could in theory. There is no law preventing them from relying on it. But it would be open to you to challenge it as unreliable which is the current test.
Well, that might well be right.
They can present any evidence but it may not succeed,