Question: what does tier 1 sex offender mean?
Answer: A Tier II sex offender must register for 25 years. A Tier I sex offender is someone convicted of a sex offense not included in the other tiers. ... A Tier I sex offender must register for 15 years, but with a clean record (as defined in the act) the registration is reduced to 10 years (§§ 111, 115).