I have to respectfully disagree. We have no idea what LE was doing, investigating, try to get warrants for - behind the scenes. These kinds of tragic crimes don't play out like a 1 hour episode of Criminal Minds. It's entirely possible that behind the scenes and totally unbeknownst to us, they taking the proper legal and procedural steps to get warrants for Facebook to give up the IP address of the person posting from Carver's FB acct. These things take time, often a lot of time. But just speculating here ....maybe they were finally able to obtain the IP address of the computer/device making those fake FB posts, then had to continue to investigate whether they were posted with a computer or device (smart phone)....then do whatever was necessary if confirmed they came from a phone to determine who that phone belonged to, then ping that phone, etc. There is SO much that goes on behind the scenes that the general public has no clue about. Even when LE has a lead they have to follow proper steps and protocols to obtain more info on that lead such that should it pan out and the case goes to court that nothing gets thrown out. It's not fair to blast LE based only on what is made known to us. And for all we know maybe they were aware that KB had recently began working for TK prior to her disappearance but they had reason not to divulge such info. Maybe they did speak with him long ago but clearly the guy's a sharp cookie, and they didn't have enough to get a search warrant to search him/his property/arrest him. There's just so much that we don't know.