Virtual Visits
I would say one of the one benefits of Video Calls over phone calls is that you can record the Video Call using things like Camtasia Studio or other Skype recording tools.
If a child is being interfered with, this would be obvious in a Video Call as you can SEE the reaction of the child and recording it would be clear evidence.
Check to see if your state allows recording without BOTH parties being notified. Many states allow recording when only one side knows the communication is being recorded.
Then it is up to the judge or legal folks involved to decide if interference is involved.
Regards
TX Mike