From their web site: Police Health is restricted access private health insurer exclusive for:

1. Current Australian police officers and police employees of state, territory or federal police departments, police unions and associations.

2. Retired and former police officers, and employees of police departments, unions and associations in Australia who resigned on or retired after 1 January 2001 (or any time for South Australia).

3. In addition, eligibility also extends to the families of the above:

partners, including spouse or defacto
former partners
dependent and adult children (including the partners and dependent children of the adult children)