On July 29, 1994, 7-year-old Megan Kanka was killed by Jesse Timmendequas, a convicted sex offender who lived across the street.

For over a century, electricity has been used as the ultimate punishment on criminals who've gone violently astray of the law. Soon, it may be used to rehabilitate them. In July 2018, a new study was released suggesting that running electrical currents through people's brains reduces their desire to commit acts of aggression.

Gary Leon Ridgway, who raped and murdered more than 49 women, was obsessed with deviant sex and visiting prostitutes. This, combined with his aggression and violence, were significant driving forces behind his murderous actions, says Mary Ellen O'Toole, a retired FBI senior profiler who interviewed Ridgway.

Karin Ahrman, who has a 13-year-old son, received a flyer in her mailbox notifying her that a registered sex offender had moved in a few houses away. She talks to us about her fight to inform her community about their need for vigilance against sexual offenders.

Linda Fairstein, former sex crimes prosecutor, and Cynthia Calkins, PhD, a forensic psychologist, on how we can protect our families from sex offenders.