I find these “devil’s advocate” perspectives a bit trying at times - yes testing would lead people to stay at home (since we could simply post a cop outside), yes testing would reduce PPE use (we would reduce transmission before a new case ever could walk in the ER door). You don’t need GPS data to do contact tracing.

Really, there’s no excuse for the abysmal US testing regime. We’re beyond a point where contact tracing is feasible, but there is no reason we had to get to this point.