But useless, probably. If @vonbobo and a friend swap IDs for a day and simply do not look directly at the guard they’ll find out that most guards don’t have the superhuman resistance to tedium that’s required for such systems to work. If the guard says “this picture doesn’t look like you” just laugh brightly and say “I know! Everybody says that! I look like an old black guy in that picture, isn’t it amazing? And they won’t give me a new one, either!” or whatever. They’ll let you in.
It’s the same thing as signatures on credit card bills. In theory, your waitstaff is comparing your signature to the card. In reality, you can write anything you want, 99.999% of the time. Because humans.
