"SECTION 25.30
Operator prohibitions
Arts and Cultural Affairs (ACA) CHAPTER 11-C, TITLE G, ARTICLE 25
* § 25.30. Operator prohibitions.
(c) employ a paperless ticketing system unless the consumer is given
an option to purchase paperless tickets that the consumer can transfer
at any price, and at any time, and without additional fees, independent
of the operator or operator's agent. Notwithstanding the foregoing, an
operator or operator's agent may employ a paperless ticketing system
that does not allow for independent transferability of paperless tickets
only if the consumer is offered an option at the time of initial sale to
purchase the same tickets in some other form that is transferrable
independent of the operator or operator's agent including, but not
limited to, paper tickets or e-tickets. The established price for any
given ticket shall be the same regardless of the form or transferability
of such ticket. The ability for a ticket to be transferred independent
of the operator or operator's agent shall not constitute a special
service for the purpose of imposing a service charge pursuant to section
25.29 of this article."
Maybe you were thinking of this? It doesn't mandate actual paper tickets, which as of this season, the Bills say they no longer offer.
Of course, you can print out your electronically purchased ticket on a piece of paper in your computer printer and if it's real, they will allow entry.
But no one is dumb enough to buy a print out on Abbott street from some dude....