Seriously if everyone paid $4 or $5 dam even $50, I could in under 6 months at any airport, make a joke of that "security" for I expect less than $250,000 if I wanted to.
And nothing will prevent a 9/11 type event happening but in a different form in the future.
Have not had a ASIC in years, certainly been airside in that time - but never asked. Its all a joke and revenue/political illusion of safety to supply money to companies that then give political donations.