The fact is airside is sterile
Hang on a minute while I pick myself off the floor. I fell over laughing so hard at that statement.
Those of us who fly these aircraft for a living know exactly how "sterile" airside really is. It's about as sterile as a pig farmers cess pit!

Mind you, just goes to show you how gullible the travelling public is if they believe the cosmetic joke that is called 'security' these days.