Investigators locked in a four-week manhunt for alleged police killer Dezi Freeman could soon face the prospect of "drawing a line in the sand" as resource restraints and costs pile up.

Freeman, also known as Desmond Filby, allegedly fatally shot Neal Thompson and Vadim de Waart-Hottart at Porepunkah on August 26.

The 56-year-old has been on the run since, fleeing into dense bushland from the town about 300km northeast of Melbourne.

Backed up by interstate crews, about 450 police personnel have packed the town of about 1000 residents, scouring harsh and challenging bushland, caves, mineshafts, huts and properties, by air and land, in the hope of finding the alleged culprit.

A month on, as the manhunt continues with yet no confirmed sighting of the trained bush survivalist, police must

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