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Obtaining services by deception?
There is a long tradition of that in the pub. I'm sure I'm not the only one that lied about my age when I was 17.
People lie and cheat and aren't put off by potential sentences. They are influenced by perceived risk of being caught. I don't think the odds of being caught using a fake app or certificate in a pub are very high. Do you?
I'm half vaccinated and have my second shot booked so it doesn't really matter to me but I'm sure there are plenty of people that don't want to be vaccinated and would be prepared to cheat.
I'm more interested in if vaccination passports are rolled out to things like pubs.
Sooner or later I expect something which can be verified (eg a QR code with a signed ID which can be checked against a database). From a privacy perspective that doesn't really matter when you are crossing a border since they already have your passport and the government knows you are travelling but might be less well received for a trip to Wetherspoons.