Comstock, which was named for Graydon Comstock, the first man detained under the Adam Walsh act.
In another case that made headlines, in 1981 someone abducted 6-year-old Adam Walsh from a Florida shopping mall and killed him.
The government has lost roughly half of the more than sixty Adam Walsh cases that have gone to trial so far.
Since the passage of the Adam Walsh act, the Butner program has shifted its focus, and prisoners serving criminal sentences are no longer eligible.
Only offenders held under the Adam Walsh act are treated there.
Etan's family and Adam Walsh's parents have been particularly media savvy, she said, as they kept their cases front and center before the public and law enforcement.
The federal Adam Walsh Act, which was passed in 2006, requires registration for juveniles 14 and older in cases of serious sexual assault involving force or threat of violence.
CNN: Report: Registry does more harm than good for teen sex offenders
The federal Adam Walsh Child Protection and Safety Act was passed in 2006 with the goal of creating a national set of standards for dealing with sex offenders and predators.
Sixteen states have formally adopted the Adam Walsh Act's Sex Offender Registration and Notification Act, a comprehensive set of minimum standards for sex offender registration and notification in the United States.
CNN: Report: Registry does more harm than good for teen sex offenders
To date, 15 states, two territories, and 27 tribes have implemented those provisions of the Adam Walsh Act, known as the Sex Offender Registration and Notification Act, according to the Justice Department.
CNN's Ashley Killough, Adam Levy, Deirdre Walsh and Greg Botelho contributed to this report.
CNNMoney's Jose Pagliery and CNN's Adam Aigner-Treworgy, Brianna Keilar, Jessica Yellin, Deirdre Walsh, Ted Barrett, Greg Botelho and Kevin Liptak contributed to this report.
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