Maybe? Not my cup of tea, but if I didn't trust my wife, and she allowed me to track her, maybe that'd solve whatever hypothetical problem we were having. Very unlikely, but I don't think the idea itself, doomed to fail or not, is a problem if both parties consent.

Which is what you do when you work for an employer that wants to track your entries/exits into their buildings. You consent to allowing systems to be put in place that serve as placeholders for when trust isn't yet or won't be established.

What are you talking about?