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I understand, but here's where the problem starts. The court might well not like the idea, but at the end of the day I don't think it's unreasonable to check the photo for errors without having the risk of making things worse.
After all, it's been proven that speeding cameras are NOT 100% accurate - a quick google will bring up cases where the police have chased the case right to court, only for a mistake at their end to cause them to lose it.
Now Joe Bloggs might well have gotten flashed for a crime he did not commit, but due to fear of losing the case might well not bother fighting it. And that's an utter travesty, and where the coercing comes into play. The police are relying on the fact that people are afraid of losing the case and making things worse for themselves, in order to obtain convictions where they might well not exist.
Then again, it's been the case in this country for a long time now - when it comes to speeding, you're guilty until proven innocent.