Sergeant Zaglifa meets the girl he helped rescue.

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Posing as a pedophile, Chicago area police officer Mike Zaglifa discovered Mancuso in an online chat room. Sergeant Zaglifa says his instinct told him this man was an absolute danger to children. Working with other agents, he traced Mancuso's Internet address to a location near Pittsburgh, where he was later arrested.

During their investigation, police officials had no way of knowing that the little girl in the photographs was Mancuso's adopted daughter. Her rescue, says Sergeant Zaglifa, was an unexpected reward for what he calls the "physically and emotionally draining" work of capturing child predators.

Sergeant Zaglifa says that to gain proper perspective on the severity of child pornography, it's important to call them "child sex abuse images." "When those images are being made," says Sergeant Zaglifa, "that's sex abuse in progress." He offers his expert advice for how parents can protect their children: "The number one thing is: No chat rooms."

Two years ago, Matthew Mancuso was sentenced to 15 years on federal pornography charges. He also pleaded guilty to the horrible sex crimes he committed against Masha and was sentenced to serve 35 to 70 years in prison. The house where he and Masha lived has since been sold to a new family.