Look, I can understand that with modern technology accessing things like that could be easier, but the police did half-ass their jobs. You can easily access the contents of a mobile phone. Especially because this was before the time that phones were password protected if we have the timeline right.
Also, why is the mom just having the psychological breakdown NOW, years after the fact instead of when it happened?
Also, not social media site aside from Live leak would allow that kinda shit to be uploaded, especially if they're a minor because that's child porn. And this should technically be all the evidence they need to vindicate him.