Over the past quarter century Congress, state legislatures and the courts have radically reshaped America's laws dealing with sex offenders in an effort to reduce the prevalence of sex offenses. Most convicted sex offenders must now register with the authorities, who then make information about them available to the public. Possession of child pornography has been made an extremely serious crime often punishable by prison sentences that dwarf those meted out to child molesters, rapists, robbers, and even killers. Federal law now imposes a minimum sentence of ten years in prison for those...