Every airport is different.
As far as passengers go,in Perth you nearly end up getting all your clobber off.Same clothes etc in other airports are no worries.
Qantas link country airports which now have security are hard people to please as well.
But i had a laugh in July from Devenport to Melbourne.No checks till after you have landed.
with a certain event in Melbourne tomorrow a Dash 8 could wipe out more than 911 did.
Luckily none are flying in during that time.
As said by all ,security can never be 100% but there are still a few weak points