Weird security issue

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http://androidforums.com – Hey all. I volunteer as an advocate for abused children, and was recently contacted by a woman in a really bad situation. Not going to go into details, but her ex has been stalking her and her children. Reason I'm bringing this here: she made the comment that he "always knows when I'm home or leave", and questioned if there was some way that he could be tracking her via her phone. I know I've heard of some tracking apps out there, and figured I would bring the question here. So CAN a private citizen track another via their android (without an app installed for such)? If so, is the (General)