[raxxorraxor]

Would they be liable if a kid stole an id from an adult? If not, probably because the site had protection against minors accessing their site. If that is the requirement, a simple window asking for age would suffice, right?

[ndriscoll]

Would a physical store be liable for a kid stealing an id from an adult? Likely it depends on how passable it is that the id belongs to the kid. In any case, obviously a simple window asking age (or in person, simply asking "are you 18/21?") would not suffice.