Airport Security Air Side - there simply is none.
In many years working domestic ramp I was only ever asked for my ASIC one time by the authoritars.
To mock the stupidity of it all, I used to wear my medicare card and sometimes my credit card over my ASIC and nobody ever commented or challenged me.
The farce of it all is that you get all but a cavity search to get on a plane as a pax or a crew, yet the ramp is almost totally ignored.
It's all about visible security to the public), and not at all about real security.
The ongoing lack of security on the ramp and the relatively small ocurrance of security issues there really does show up what a total overkill and farce the up stairs airport security is.