Waxed eyebrows have taken centre stage at the trial of John Ibrahim's girlfriend with analysis showing they came from former Sydney high-end real estate agent Ryan Watsford, although another man's DNA was on the waxing strip.
Sarah Budge, 29, has pleaded not guilty to three weapons charges after NSW Police found a defaced Glock 26 pistol and a magazine loaded with some 16 bullets in her Double Bay unit in August 2017.
Australian Federal Police forensic biologist Greg Robertson testified at her trial on Wednesday, revealing that as well as being asked to test for DNA left on the trigger of the stolen gun he was also asked to test "a pair of waxed human eyebrows".
The biologist was given the eyebrows for analysis and also the fabric and wax that was used to rip them from someone's face.
In the NSW District Court, Mr Robertson said he had found the DNA of an unidentified man - dubbed "Male One" - on the trigger of the pistol and on the black beanie it was hidden in.
He explained to the court that DNA found on a "tape lift" taken from the fabric used to remove the eyebrows also matched the DNA profile of Male One.
Male One's DNA didn't match any of the reference samples provided to Mr Robertson by police.
The court heard Budge had provided police with her DNA via a mouth swab but the court heard that the reference samples did not include a sample from John Ibrahim.
The hairs themselves, however, matched one of the reference samples Mr Robertson was given by police - that of Mr Watsford.
Budge's barrister, Simon Buchen SC, also questioned Mr Robertson over an inquiry made by investigators in March 2018 about the potential of a "familial comparison" being made against the DNA of Male One.
Mr Robertson said while he was initially unaware police wanted to compare the DNA of Male One with one of John Ibrahim's brothers, from memory he later understood that was the case.
However, Mr Robertson said he advised police of the potential of a false negative result when comparing the siblings' DNA due to their only sharing 25 per cent of their DNA.
The court heard that following Mr Robertson's advice, the test was never carried out.
Mr Buchen has previously suggested Mr Ibrahim or one of his associates hid the pistol and ammunition in Budge's bedroom wardrobe days before police found them.
The trial before Judge David Arnott continues.