SIUYA, you're right of course, I'm drowning in a sea of acronyms
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Speedbird61, the Aviation Transport Security Regulations set out screening requirements for aviation areas and state that LAG screening is for international flights only, see section 4.22A-Q in the link below.
AVIATION TRANSPORT SECURITY REGULATIONS 2005
The Brisbane DTB screening points should not be removing LAG items. I routinely travel domestically with water etc and while some ports inspect aerosols I've never had LAGs removed from my baggage. If I recall correctly, the DOI chose to introduce LAG screening on international flights only as they were perceived to be a greater risk than domestic flights. If you are really concerned then I suggest you email them and ask.
www.infrastructure.gov.au