I keep seeing people saying that LE "knows" who did it, but that they're "building an airtight case." We must have vastly different experiences with LE & DAs then. My experiences with LE here, and with LE in Delphi, is that if they have reason to suspect a person of comitting a crime-especially a major one-they'll arrest if they have any evidence at all. Especially in a high-profile crime. They'll often work with the DA as a professional courtesy, and they will bounce ideas off of each other, but I can't fathom a situation where LE would say, "We know this dude brutally killed 2 kids, but prosecution doesn't think we're ready so we will hold off on an arrest. Hopefully he doesn't kill anyone else in the meantime!" I have multiple family members in LE including some in the Delphi area, family that works homicide and narcotics, and they have always erred on the side of caution when it comes to public safety. They gather evidence, they interview, they make arrests and keep the public safe-the DA is the one who puts all of that together to ensure that it's an "airtight case." I can see a world in which they have an idea of who it might be, but don't have any hard evidence in which to back it up. I can not, however, after a dozen years of writing true crime and listening to LE discuss things off the record, fathom them holding off on the arrest of a high-profile child murderer who could very well attack again.
They must have some evidence since they've weeded people out.