They probably only stay on the list while living in the state.
Beats me, really.
I am not sure, but you could the police or a lawyer and ask them, they would probably know.
You really expected an answer in 3 minutes?
10 years worth of registration, annually, unless the person's adjudicated as a "sexually dangerous" or "sexually violent," in which case they have to register every three months for life.
A sex offender who is required to register must register in person annually for a 10-year period. A sex offender sentenced to probation will start his/her 10-year registration period from the date of his conviction or if sentenced to a hospital or Department of Corrections, the 10-year period starts from the date of parole, release or discharge. A person who has been adjudicated as Sexually Dangerous, or Sexually Violent must register with the law enforcement agency having jurisdiction at his or her place of address every 90 days for natural life.
Who is required to register, you ask?
Well, here's the laundry list of offenses:
Any adult or juvenile found guilty of any of the following crimes:
Indecent Solicitation of a child;
Sexual Exploitation of a child;
Soliciting for a Juvenile Prostitute;
Keeping a place of Juvenile Prostitution;
Patronizing a Juvenile Prostitute;
Exploitation of a Child;
Criminal Sexual Assault;
Aggravated Criminal Sexual Assault;
Predatory Crimial Sexual Assault of a Child;
Criminal Sexual Abuse, when a felony;
Aggravated Criminal Sexual Abuse;
Ritualized Abuse of a Child;
Forcible Detention, if the victim is under 18 years of age;
Indecent Solicitation of an Adult;
Soliciting for a Prostitute, if the victim is under 18 years of age;
Pandering, if the victim is under 18 years of age;
Patronizing, if the victim is under 18 years of age;
Pimping, if the victim is under 18 years of age;
Unlawful Restraint Aggravated Unlawful Restraint;
First Degree Murder of a Child;
and Attempts to commit these offenses.
More info here: