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Allegations that an Immigration Department worker and former Australian Federal Police officer, accused of a sex attack in West Perth, meticulously planned to track down women using their airport passenger cards and assumed other people's identities have been revealed in a Perth court.

Stephen Michael Adams, 44 of Como, is charged with sexually assaulting a 19-year-old woman in West Perth in March last year and preying on a 26-year-old woman in the same area the following month.

Both times he allegedly threatened to rob the women, showing them what appeared to be a gun tucked into his pants in a bid to force them into a secluded area.

State prosecutor Sandra De Maio told the Stirling Gardens Magistrate's Court today that while the first victim was sexually assaulted, the second victim managed to fling her bag at the offender and run away.

Mr Adams was arrested and charged in December last year after allegedly trying to evade police in Wembley. He was riding a similar motorbike, allegedly with stolen number plates, to one captured on CCTV camera leaving the scene of the second crime scene, the court was told.

Mr Adams, who is charged with two counts of aggravated sexual penetration without consent and one count each of deprivation of liberty, armed robbery and attempted armed robbery, was denied bail for the second time today.

During his application, Ms De Maio said police had uncovered a storage unit rented by the accused under an assumed name and found passenger cards with the details of various females on them, with comments like "short but stunning" and "great body" and evidence that the accused had allegedly tried to track down their addresses.

She said 21 items that the second victim identified as belonging to her, including a Gucci bag and identification, were also found in the storage unit as well as a BB gun and a taser.

The prosecutor said also discovered in the storage unit were credit cards under stolen identities, stolen number plates and other items such as disposable gloves that Ms De Maio said appeared to suggest a "rape kit".

She said when he was arrested Mr Adams was found to be in possession of pepper spray, a kitchen knife and a syringe filled with an erectile dysfunction drug.

Ms De Maio said police found various backpacks with similar items in the storage unit, Adams' home and workplace.

Defence lawyer Seamus Rafferty said the circumstantial case was tenuous, with a lack of positive identification of his client by the alleged victims and labelled the claims of a rape kit in the storage facility was "fanciful" as there was no evidence gloves were used in the offending.

He said the DNA evidence was not strong and at its highest only suggested his client was part of a category of one in 850 WA men who could not be excluded as a possible contributor to DNA collected from the first victim, who scratched her attacker.

He said the magistrate who initially denied Mr Adams bail was misled by being told there was a DNA match.

Mr Rafferty argued it would be virtually impossible for Mr Adams, who worked for the Department of Immigration on Wellington Street, to flee the country because he would be so easily recognised by his work colleagues.

He said Mr Adams had no prior convictions and there was no suggestion any offending had taken place in the eight months between the last alleged offence and his arrest.

Ms De Maio said further charges against Mr Adams were likely, including possible fraud offences.

She said in a notebook found in the storage unit the accused allegedly wrote one of his New Year's resolutions for 2009 was to "steal someone's identity."

Ms De Maio said even without the DNA evidence the State's case was strong.

The court was told a number of police uniforms were also found in the storage unit, but Mr Rafferty said that was not incriminating because his client was a former AFP officer.

Magistrate Jan Whitbread said Mr Adams appeared to be a very organised and meticulous man and upstanding member of the community.

But she said at this stage the circumstantial case appeared strong and no bail conditions, including home detention, electronic monitoring and the surrender of Mr Adams' passport, could allay her fears about the risk of reoffending and the accused fleeing.

Mr Adams was remanded in custody to reappear in court next month.