SJ
Premium Platinum
You can be checked at the gates (but it is rare, especially for big crowds). If caught you will lose your ticket.Just a word of warning for any adults that have rorted the system and bought kids tickets to get in.
My mate reckons that they'll get you into the ground but when you go to your actual seat they'll check them.
You will not be checked for ticket type at the top of the aisles.