I sure would like to see the phone records for Ron and the times he made the 20+ calls to Misty when she did not answer. And the time he made them, especially the last one and where it pinged from.
I believe she was with a member of his family and was told to turn her phone off so it could not be traced and her whereabouts be known. Ron then called to set her up, making it look like she was not home but he did not know that.
I am not giving much credence to the drug od theory, unless it was accidental.
If that was the case it would be too easy for Ron to blame Misty, saying she did it all on her own, denying he told her to do it and having her take complete responsibility.
JMO