After he disappeared nearly 27 years ago, Jacob Wetterling's remains have been found. Why did it take so long? 

The abduction of Jacob Wetterling, which made parents more vigilant and led to the first national requirement that states track sex offenders via registries, took place before moonrise on a warm October night in 1989. 

When Jacob Wetterling was taken, authorities launched what would turn into one of the largest searches for any missing person in the history of the United States. But that first night, law enforcement didn't cover all the basics. 

The closest you can get to a conversation with Jacob Wetterling about his abduction is to talk to Jared Scheierl. Scheierl was walking home from an ice skating rink in Cold Spring in January 1989 when a man who turned out to be Danny Heinrich forced him into a car, assaulted him, and let him go, uttering some chilling parting words: "If they come close to finding out who I am, I'll find you and kill you." That was nine months before Jacob's abduction. 

The Wetterling abduction story kept getting bigger as the case served as a conduit for public fear and grief. Capitalizing on a growing sense that pedophiles lurked in every shadow, the likes of Maury Povich and Geraldo Rivera joined the cause with sensational retellings of the crime and its consequences.

Dan Rassier now wishes he'd insisted that police search his family's St. Joseph farm top to bottom the night Jacob Wetterling was abducted. That way, they would have known there was nothing to find. And it would have been harder for them to come back 21 years later to search with backhoes and declare him a "person of interest" in the case. 

In the 1970s and early '80s, missing children weren't considered a policing priority. You couldn't even enter missing child information into the FBI's national crime database. But that changed quickly. 

Soon after the abduction and murder of Jacob Wetterling in 1989, Stearns County sheriff's investigators came face to face with his killer, Danny Heinrich, who would confess to the crime 27 years later. Then they let him go. It wasn't the first time that had happened in Stearns County.