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Yeah, the victim likely shot himself three times and engraved words on every casing. /sarcasm
Seriously, what kind of evidence are you expecting to find?
EDIT: To be clear this is not an ironic question, if we’re accusing the police of willful ignorance we should at least present a decent argument. What do we look for?
Its much safer to leave no evidence and use some tricks to lock the door behind you than to leave misdirecting evidence like a manifesto and fake weapon or something like that.