So how do they prove they actually checked someone's age?
They don’t need to prove that. The government or whatever would have to prove that they aren’t checking ages, by going to the site and seeing a lack of age verification.
How does shop clerk proves they checked someone's age before selling them alcohol?
They don’t need to prove that. The government or whatever would have to prove that they aren’t checking ages, by going to the site and seeing a lack of age verification.