I found messages on his Facebook with drug use. He doesn't know I still know his password from when we were dating when he gave me it. I want to start a custody case against him and was wondering if I could use this as evidence that he has not changed and, potentially, not a fit father. Would it backfire against me if I presented this? I've heard it's illegal but my ex did give me the password willingly. He blatantly said the drug he had taken was LSD and in other messages he talks about wanting to get high. To clarify these messages were sent to a friend of his and not to me.
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