You could be giving them information about him that they need for another case. At the very least, you have his name, address and phone number.
Say they need to identify a murderer from a few identifying details, and you happen to know him very well and have all his contact details - or at least his past ones? Even if he changes them, you will still be able to maintain that in such-and-such-a-year, he lived in such-and-such-a-place, and that might corroborate with other evidence and validate it so that the investigators can draw a conclusion from it.
I dated a potential serial killer. ( narcissistic abuse)
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You could be giving them information about him that they need for another case. At the very least, you have his name, address and phone number.
Say they need to identify a murderer from a few identifying details, and you happen to know him very well and have all his contact details - or at least his past ones? Even if he changes them, you will still be able to maintain that in such-and-such-a-year, he lived in such-and-such-a-place, and that might corroborate with other evidence and validate it so that the investigators can draw a conclusion from it.