The recent recovery of Jaycee Lee Dugard, who was located 18 years after being abducted by a stranger, once again has parents thinking about how to protect their own kids. That's one of the reasons behind a growing number of child locator products that typically use GPS and a cellular device to help a parents and authorities pinpoint a missing child to within a few yards.

But before getting into the technology, here are some important statistics to put this problem into context.

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