Lawyers for the man charged with carrying out Melbourne's Easey Street murders have failed in a bid to prevent the media reporting about "explosive" DNA evidence in the high-profile case.

Perry Kouroumblis, 66, is charged with murdering Suzanne Armstrong and Susan Bartlett in their Collingwood share house on Easey Street sometime between January 10 and January 13 in 1977.

He is also charged with raping Ms Armstrong.

Mr Kouroumblis is facing a committal hearing before Magistrate Brett Sonnet who will hear evidence and decide if the case should proceed to a Supreme Court jury trial.

On Wednesday morning, defence barrister Dermot Dann KC said there were "all sorts of issues relating to contamination" with DNA evidence that prosecutors planned to use against his client.

He described the d

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