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I guess I'm wondering what/if there's a remedy if you get arrested on only evidence that was never admissable in the first place

Why do you say it's not admissable? Camera evidence is admissable, so far as I know. The missing cop you're referring to would provide corroboration. The camera evidence by itself, without corroboration, may not be adnissable, because the evidence can't be challenged meaningfully.

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