The National Anti-Corruption Commission’s decision not to investigate officials at the heart of the Robodebt scandal — a decision it took a year to announce — comprises just two pages.

The long promised federal anti-corruption commission is marred by “silence and secrecy”, says top legal expert.

Attorney-General Mark Dreyfus used fudged data to justify implementing the almost entirely secret National Anti-Corruption Commission, vastly understating the amount of NSW anti-corruption hearings held in public.