With all do respect, none of the aforementioned individuals are going to allow their victims the privilege of a cell phone. You're going to find that phone in a ditch somewhere or a pawn shop, if you're lucky. And, as another member said, most rapes and murders occur within a social group.

The tracking device is, more than anything, to put the parents' minds at ease at the expense of trust and freedom.

And... Who's to say the same technology couldn't be used against the victims? For example, an abusive man/woman could use it to further control his/her spouse.

It's my humble opinion that the phone companies are capitalizing on parents' fear.