France will require people to show a "Covid health pass", which is
proof of vaccination or a recent negative test, to enter a
restaurant, a supermarket, or a train.
Checking people's vaccination status is necessary, for now. Doing it
digitally is dangerous because it leads to tracking people's movements
digitally. For a vaccinated person to catch Covid-19 is unlikely
enough that there is no need to identify them.
I also wonder whether people who don't carry mobile devices full of
nonfree malware will be excluded simply for that.