Quote:
The nine-year-old girl was kidnapped from her parent’s home in Toronto, Canada, while her family slept
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The kidnapper entered through an open window or one that was easily and quietly opened from the outside.
My idea: lock your doors and windows when you're sleeping, and/or don't put your children in rooms with windows that can be entered through.
Your idea:
Every home, school, and mall would need perimiter sensors to determine when a child leaves. Horribly cost-inefficient.
A heart rate sensor would be activated every day at recess, whenever the kid got in trouble in school, or whenever there is an exciting activity in class (or at home, or whenever).
Ten people standing in a small area have cell phones ringing in a mall. In the vicinity of those ten people there are twenty children, and there are several more in the parking lot (presumably the location of the distressed child, since the alarm is triggered when the kid leaves the mall). The one person out of the ten who runs out to the parking lot and accosts the nearest shady character with a child gets maced or knocked out because the shady character thought the concerned citizen was attacking his daughter.
No one would buy a cell phone equipped with such a system because of the inevitable number of false alarms. For every kidnapping, there are a million instances of kids skipping out of school, getting lost for a few minutes, or fucking around with some little gadget their parents made them wear.