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The best thing you can do in these cases is line up potential witnesses, have a good defense prepared, and be ready to attack the officer's investigation. Nine times out of ten if you do that, it is a winning strategy. Also, always pull the police procedure manuals to see how they are supposed to process guns when found, what the procedures are for questioning witnesses, and how they are supposed to handle scientific testing of evidence. The policy manuals should be freely available in your jurisdiction upon request.