Typically what I've seen is if something is policy before hand, then it's legal, such as retention policies for email. In this case to do something similar, yo

Typically what I've seen is if something is policy before hand, then it's legal, such as retention policies for email. In this case to do something similar, you would need the phone to not retain more than 24 hours of information or similar or be jumped and have your devices forcibly taken a away and get into some sort of 5th amendment edge case where you don't have to give the contents of your mind / say anything.