Australia does not currently have a dedicated national-level anticorruption agency (ACA), though the question of whether to create one has been on the table since 2014 (see here, here, and here). Yet Australia has plenty of experience with ACAs—at the state level. Australia’s first, and still most prominent, state-level ACA was the Independent Commission Against Corruption (ICAC) in New South Wales (the state including financial capital Sydney), which will mark its thirtieth anniversary next year. The ICAC, led by an independent commissioner, has independent investigatory powers over almost all state-level government officials and is charged with both exposing public sector corruption and educating the public about corruption. Queensland and Western Australia followed suit with their Corruption and Crime Commissions, established in their current forms in 2001 and 2003 respectively. The states of Victoria, South Australia, and tiny Tasmania all instituted independent agencies in recent years as well. Even the 250,000-strong Northern Territory resolved to start its own ACA after several high-profile scandals, and the Australian Capital Territory (the Canberra-sized equivalent of Washington, DC) has discussed creating its own anticorruption body. The permeation of Australia with state-level agencies is essentially complete.
Thus, in true laboratories-of-democracy fashion, Australian states have tried, solidified, and publicized the model of creating an independent investigatory group focused on the issue of corruption. Could U.S. states do the same? Easily. Should they? Yes, for at least three reasons: