I suppose if VICPOL thought it was a person from Ballarat, like.. say, Paul Denyer, someone who might take and disappear someone else, they would have locked down Ballarat, close off the freeway, and the north and south exits and entrances, and established a curfew, all men off the street from 5pm to 9am, something like this, all cars checked and divvied up, have armed personnel all around the perimeter.... close all the pubs and bars, bottle shops, etc.. clubs...all footy training and cricket training off, etc.... close the city down...
But this seems a very softly softly approach, nothing wrong with that, it often works, too..