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The development of recent statutory schemes, in both the United States and Australia, aim to keep the most dangerous sex offenders detained beyond the expiration of their prison sentence. In Kansas v. Hendricks (1997), the United States Supreme Court found constitutional Sexually Violent Predator (SVP) legislation that allows for the post-sentence, indefinite civil commitment of a subclass of dangerous offenders. More recently, the Australian High Court in Attorney-General (Qld) v. Fardon (2004) similarly upheld the constitutionality of Queensland's Dangerous Prisoners (Sexual Offenders) Act (2003), which allows for the post-sentence preventive detention of sex offenders deemed to be at high risk of serious sexual recidivism. Because an evaluation of a sex offender's likelihood of re-offending is fundamental to these schemes, this article provides an overview of recent advances in the risk assessment literature …