And I have advanced an arguement. What's more important? Your childs privacy or their safety? Should the right of the parent to protect their child be over ridden by some percieved violation of privacy? For decades now..if not centuries it has been understood that a parent can and often does go into a childs room and look around or listen in on a conversation that they have.
Merriam-Webster defination for kidnap
Merriam-Webster defination of abduction
For example: Parents get divoced. Parent A gets custody of child and Parent B is refused any contact with Parent A or the child. A few months go by. Parent B kidnaps the child. Unbeknowest to Parent B Parent A had gotten into the habit of placeing the device in the OP on the child. Due to that child is recovered and Parent B is sent to jail.