One evening last winter, Mike Harris was watching his local TV news when he saw a segment that caught his attention: Parents were using software to monitor their kids cell phones.As more kids carry cell phones, some parents are using software to monitor their calls and texts.

Harris, an investigator for the Child Sex Internet Investigations Unit in Jefferson County, Colorado, thought the service could be a new tool for combating sexual predators.

Equipping his phone with the software, Harris posed as an underage child on social-networking sites and began luring pedophiles. He immediately got results. Since then, Harris has made 83 arrests of alleged sexual predators -- 44 of them with the help of the monitoring program.

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