This act modifies provisions relating to the sex offender registry. Instead of listing certain sexual offenses, this act provides that any person who, since July 1, 1979, has been or is adjudicated for a tier I offense, tier II offense, or tier III offense in this state or in any other state, territory, the District of Columbia, foreign country, or federal, tribal or military jurisdiction shall be required to register as a sex offender. (Section 589.400) Offenders shall be classified as a tier I, tier II, or tier III offender. To the extent more than one tier definition applies, the highest tier shall be applicable tier for the offender. This act also provides that certain juvenile offenders and certain offenders who live or work in Missouri with registration requirements by other jurisdictions shall be assigned a tier, which shall be only for the purposes of registration visit frequency and removal eligibility. The initial determination as to the tier shall be made by the registration official and the Missouri State Highway Patrol ("Patrol") shall analyze the tier designation for accuracy. (Sections 589.400 and 589.414)