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When I was an LEO the tickets were uniquely numbered and had to be accounted for. There was no tearing any of them up. If I needed to "void" one I filled out a report stating why. I don't know other departments rules but I would definitely be cautious about this one.

You should have the badge number of the Officer. Perhaps you can get in touch with him to verify the conversation. You could also, discretely talk to other LEOs in the department to find out their department rules for this sort of thing.