What is the law regarding a tracking app on personal devices?

Question Details: Our school district is requiring all employees to download a tracking app to our personal devices in order to "aid in the reunification process" if there was ever a school threat. This tracking device tracks where individuals are at all times, even during non-school hours/vacations/etc. The district claims, "We are not tracking your location and this will solely be used for staff and student accountability and reunification". However, I have an issue with something like this on my personal device not a school owned or paid for phone.

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