............never have subscribed to the nonsense that the bureaucrats know better..
That said, I would have thought though that a common standard for pax airside screening would offer more benefits to all concerned..........justification you ask? - why has stuff in the bottom of my flight bag been screened and passed by dozens different screening points over 6 months - only to be pulled up by one yesterday............then the security operator quietly said - "you should used the other line - it's less sensitive...."
Only one way to fix govt depts keen on controlling things - give them something to do [ATSB staff take note: tonnes of incoming paper with IRM's & RRM's coming your way soon]