well regarding peterson- the prosecuters, unfortunately have nothing but these calls.
There is no hard evidence. There is no case against him at all. Just circumstantial. He's a womanizer, he's self-centered (explains supposedly why he was going off camping with new look- "scared" of the media"), he's stupid, he's a liar. They have no evidence that he is a killer. Sadly. Even though his computer records show that he was checking the tides of the area where Laci's body was found- all circumstantial. He could get off like OJ and just get a civil suit and never pay (like OJ who says he has no intentions of ever paying it).
A good sociopath covers all his footsteps. Like Bundy- But even Bundy screwed up in the end. TOO confident. Hopefully, Peterson will slip too.