I have been doing a browse again and looking at the effect of the TSI Act and it's application.
The originating documents are worth the read, especially the 2002 accompanying memorandum, which I found here:
TSI Act
and the second reading, which surrounds the purpose of the Act and legally forms part of the intention of the Act is at:
TSI Memorandum
The question for the Honourable Senators is:
Has the Minister and Head of Department interfered with due process of an investigation under the TSI Act???
Surely the release of the SOE to the ATSB would be such interference.