Accused killer Aleksander Vojneski had a cut on his finger which was consistent with a knife slipping back in the hand when it hit something hard, a court has heard.
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Mr Vojneski, 31, is on trial for the murder of his girlfriend Paula Conlon, 30, in her Macgregor home on the night of March 27, 2012.
The mother-of-three was found dead on a single bed in her room with 11 stab wounds.
He pleaded not guilty to her murder. The trial has entered its third week in the ACT Supreme Court.
On Thursday Detective Sergeant David Crowe outlined forensic evidence officers had gathered from Mr Vojneski after his arrest, including blood samples, photographs from a whole body check, swabs to test for trace DNA, fingernail scrapings and hair samples.
He disputed defence barrister Jack Pappas's suggestion that a cut found on the leading edge of Mr Vojneski's right index finger was not consistent with a knife being forced back in the hand when it hit something hard, such as bone.
Detective Sergeant Crowe said the location of the cut suggested it could have been caused by the blade of a knife which had been pushed back towards the fingers.
Under cross-examination, Detective Sergeant Crowe said he had not ordered a forensics team to test whether that theory could be proven.
Earlier the court heard from one of the first police officers to arrive at the murder scene, who said he noticed blood on the door handle of Ms Conlon's bedroom.
Another police officer said she had contacted Canberra Hospital after the murder to check whether anyone had presented themselves with injuries that could have been caused by a knife.
She was told no one had.
Two knives police seized during their investigations were tendered to the court as evidence. The actual murder weapon was never found.
The trial continues before Justice John Burns on Friday.
