| 1997 | The then Government of Western Australia began the complex process of contracting out various justice support and prison administration functions to the private sector. Concern about privatisation saw a commitment to establish a mechanism for independent scrutiny for both private and public sector prisons. This commitment was manifest in the Prisons Amendment Bill. |
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| December 1999 | The Prisons Amendment Bill was passed, providing for the establishment of the Office of the Inspector of Custodial Services. |
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| August 2000 | The Inspector commenced duty. |
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| January 2001 | The Office became operational with core staff available and systems in place. |
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| December 2003 | The Inspector of Custodial Services Act (2003) became operative. Jurisdiction was extended to include juvenile custodial facilities. |
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