I can't figure out the volunteering of the phone. I am guessing LE could have gotten pings from the phone company? But it seems like the actual phone would be even better/more evidence? If I was a killer, I think I would have "lost" the phone. I can't figure the stupidity of carting the phone around with him most of the time. A burner phone wouldn't have been a good idea unless he only used it to communicate with MT and he was sure of her loyalty. IMO.One thing FD did that he didn't have to do was go to NCPD headquarters the day after. Have no idea what NCPD told FD about the purpose of this visit but we know FD arrived with his lawyer. Presumably he was prepared to say or do something (superficial cooperation??), otherwise he wouldn't go. I get the impression from FD's motion to have evidence returned that the NCPD visit went south quickly. Seems like FD showed NCPD his phone and was taken aback that they refused to return it, and when the phone was confiscated FD and his attorney quickly exited. IMHO.