In sentence-length-based systems, offenders receiving sentences exceeding some determined length are included.
Sex offender registries exist in many English-speaking countries, including Australia, Canada, New Zealand, the United States, Trinidad and Tobago, Jamaica, South Africa, the United Kingdom, and Ireland.
UK, Canada, and Australia have adopted either risk-based- or sentence-length-based registry schemes. states applying risk-based systems are pressured by Federal Government to adopt offense-based systems in accordance with Adam Walsh Child Protection and Safety Act.
Risk-based registries reflect the determined dangerousness of registered offenders, while sentence-length-based registries reflect the severity of the crime.
Offense-based registries reflect neither the dangerousness of registrants, nor the severity of their crimes.
Sex offender registration does not exist outside of the Anglosphere, however.The United States is the only country with a registry that is publicly accessible; all other countries in the Anglosphere have sex offender registries only accessible by law enforcement.