From this link:
http://www.findgreatlawyers.com/Illinois-sex-offender-registration.htm (Illinois)
The list of crimes requiring registration includes criminal sexual assault, criminal sexual abuse, child pornography, three or more convictions for public indecency, permitting sexual abuse of a child, etc. These offenses – whether a misdemeanor or a felony – require sex offender registration. For a full list of crimes requiring registration, see below. Individuals convicted of an attempt to commit these crimes may be required to register, as well.
In general, sex offenders must register each year for 10 years following their conviction. This means that every year the offender must go, in person, to the police department of the city where they live, or the county sheriff's department if the offender lives outside of a city. The 10 years begins either upon conviction (for those who receive probation) or upon release (for those who are incarcerated).
Certain convictions require more frequent registration or registration for a longer period of time. Offenders who are deemed "sexually violent" or "sexually dangerous" may be required to register every 90 days for life. These are people with a mental disorder, as well as a higher likelihood of committing a sexual offense or sexually violent offense. Sexual predators must register every year for life. For a list of crimes of a sexual predator, see below.
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