The AFP seen at most airports in the states are state police dressed in AFP uniforms.
If this is meant to be a reference to Aussie airports, it may have been true a few years ago, but is not now. If you want to get rid of waste in aviation, there is a humdinger. A complete duplication of existing police services. I understand most airports remain "federal" land, but the bureaucracy and infrastructure created to police these little "islands" is astonishing. And the airports are charged by the govt for the service.