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The police are having you on in the hope that they will get something from you that might help them. They can't do anything without evidence. If there is no evidence they can't come near you. If they come back tell them to go away and come back with some evidence. It's not for you to prove your innocence. It's for them to prove they have a case against you. If they get lippy with you, get their numbers and put in a formal complaint about them. They will soon back down.
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