Sexually Violent Predator Law in the United States.

Sexually violent predator (SVP) laws in the United States are controversial. They tend to be opposed by academics, libertarians, and professional organisations but are supported by states and the Supreme Court. This study reviews the history of SVP legislation, compares features of SVP laws among states, and summarise requirements by the Supreme Court that shaped these laws. Features of SVP laws include identification of sexual offenders with mental abnormality that predisposes them to sexually offending behaviours in the future, and standards of proof for conditional or unconditional release. A comprehensive understanding of all statutes can inform policymakers about SVP laws, whether supportive or restrictive of such legislation.