Following the rape and murder of seven-year-old Megan Kanka in a small New Jersey town three years ago, by a convicted paedophile, her mother Maureen successfully campaigned for a new law in the United States to make known convicted sex offenders. Tonight's programme highlights her campaign and asks if this is the answer to preventing future crimes of this nature.
See today's choices.
See Polly Toynbee: page 14