Constitutionality[ edit ] U. Registered sex offenders will need to notify Registry officials within seven days if their work or volunteer work address changes. Phillips were once again required to register. Additionally, individuals entering Canada who were convicted abroad of a sexual offence, and those who served their sentence abroad and were released by a foreign jurisdiction, will also be required to report to police within seven days of arriving in Canada. Members of the public may be able to obtain certain types of information about specific offenders who reside, work, or attend school in the state and have been convicted of one or more of the types of offenses specified below, depending on the specific parameters of a given State's public notification program. Not all state web sites provide for public disclosure of information about all sex-offenders who reside, work, or attend school in the state. They could not use the information in the Sex Offender Registry to prevent harm before it occurred. On February 19, , the Supreme Court of Missouri held that a law prohibiting registered sex offenders from residing within one thousand feet of a school was retrospective in operation as applied to registered sex offenders who had resided at a location within such a distance prior to the enactment of the law. Information is hosted by each state, not by the federal government. For example, police can access the sex offender database and query for a list of all known sex offenders within a geographic area. Purpose[ edit ] State sex-offender registration and notification programs are designed, in general, to include information about offenders who have been convicted of a "criminal offense against a victim who is a minor" or a "sexually violent offense," as specified in the Jacob Wetterling Crimes Against Children and Sexually Violent Offender Registration Act "the Wetterling Act"  — more specifically, information about persons convicted of offenses involving sexual molestation or sexual exploitation of children, and persons convicted of rape and rape-like offenses regardless of the age of the victim , respectively. The Court held that the Missouri Constitution's provision prohibiting laws retrospective in operation no longer exempts individuals from registration if they are subject to the independent Federal obligation created under the Sexual Offenders Registration and Notification Act SORNA , 42 U.