First things first: you must retain an experienced family law attorney. Depending on the individual case and circumstances, it is sometimes possible to identify the fact of hacking into a system, and the time and other details. A computer expert might be able to help. It is also possible that they are simply working at her computer when she is away from their home. Then a more subtle investigation has to be done, and probably a private investigator (one of the good ones, hopefully) can try to establish where she was at any of the times when the emails were sent. Of course there remains the possibility that the 16-year old did send the emailsfor any of the reasons that teenagers do silly and sometimes harmful things. Then a p.i. or someone needs to speak with her. It's best to have someone highly trained in this sort of thing do so.
Answered on Jun 17th, 2015 at 2:13 PM