The people I know flouting the Albion system were slightly nervous going through the Amex turnstiles.
Is the only check just now on age group tickets, that is, an adult going in on a kids ticket?
I naively thought the Albion system was full proof. Until my in laws recently showed me their family’s Albion s/t’s in their own iPhone wallets. Not old phones used for the purpose. When their son and his family can’t make games, they just tell the parents they can go using their own phones...
Liverpool did sort that in the end, but it took decades. There was an amnesty where the real current users got to retain the s/t’s.
But illicit s/t ticket sharing still goes on, as it does with other clubs such as us.