>> reporter: 17-year-old britain mchale fell victim to a predator who tracd her to school. luckily, he was caught by police. but her mother now screens her daughter's cell phone activity, ing software called "my mobile watchdog". >> inly check it when i feel there is a change in behavior or attitude. >> repter: despite her own close call, she resisted. >> my parents sat me down and said we want to put this on your phone, it's not an invasion of pracy. and i was like, yeah, right. >> reporter: parents set up an approved call list. any number not approved reported to their phone. >> she actually communicates more because she knows we can see that. >> reporter: is this keepin children safe or strangling them with an electronic leash? >> we're leveling the playing field so parents have a way to do what they need to do as a pant. >> reporter: parents minding their children like ner before, whether their children like ior not. >> that was kevin tibbles reporting. >>> our time right now,...