I think it might be based upon a couple of issues here---1st, we had the initial report that Nadia was taken from the airport---then that was clear up by the cctv---but it still seemed odd she would 'trick' her parents in that way. Which would make LE suspicious---why the coordinated deceit factor in this situation?
Also, if it was true that Shawna filed a report with CPS about a possible abusive situation, and then the father absconds with the baby---LE HAS to take that seriously. Especially added to the weird circumstance of his girlfriend setting up her parents by leaving them baffled at the airline gate. Literally saying to Mom, 'watch my stuff, I'll be right back' ---
I cannot imagine saying that to my mom, knowing I was about to run off, leaving her shocked and worried for weeks if not months or years?
So I can understand why this is not the usual 'custodial interference case.' Usually one parent keeps the kids for longer than the court papers say----and they have whatever explanation they have to try and justify things, until eventually they have to return them.