Luke Hawking was working as a senior constable when he allegedly touched a woman's vagina during a call out to her home on February 7, 2018.

He has pleaded not guilty to rape and two counts of sexual assault against the mother-of-three.

Prosecutor Andrew Moore on Wednesday outlined the evidence that would be given in the trial, including that Hawking had allegedly changed his story.

Hawking's lawyer, Colin Mandy, said the officer of nine years denied touching the woman "in any way that was inappropriate or improper".

"He was doing his job," Mr Mandy said.

He said the woman had given several versions of the events of the night, with footage from her five security cameras to show a "very clear difference" between what she said happened and what actually happened.

Mr Moore said the mother and her children had an intervention order out against her former partner, but the man attended her home on the night of February 6.

The County Court heard the pair had a protracted argument before the man persuaded the woman to be let inside to use the toilet and refused to leave.

The court heard her ex-partner assaulted her and left with her phone, dog and her pendant before she called triple zero.

Four police attended on the morning of February 7, including Hawking, and Mr Moore said the evidence would show that he began taking a hand-written statement from her in the kitchen and later in her rear bedroom.

Mr Moore said the woman had a dressing gown over a nightie and had no underwear, and was asked by Hawking about bruises as a result of the assault.

He said Hawking allegedly pulled her gown down, exposed her breasts, and touched her breast with his finger.

The court heard he continually suggested she take medication, which she did, and Hawking kept asking about injuries.

He allegedly pulled a blanket back, pulled her dress up, lifted one of her legs and exposed her vagina.

Mr Moore said the evidence would be that the officer put a hand between her legs and touched her vagina and rubbed.

He also allegedly touched her breast again.

Hawkins allegedly gave her a business card and left, having spent about two hours at the home.

Mr Moore said the woman was "very confused, very upset, very shocked" and told her daughters and a friend what allegedly happened.

She made a complaint to police five days later.

About 10 police officers will give evidence

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The alleged victim had been due to give evidence on Wednesday, with jurors told four civilians and "about 10 or so police" would also give evidence.

The court heard the woman's two daughters and the woman's friend would also give evidence.

Mr Mandy said his client was innocent, noting the legal system meant accused people were innocent until proven guilty.

"They're allegations and they have to be proven on your satisfaction, beyond reasonable doubt, on the evidence," he told the jury of seven women and five men.

Mr Mandy said the senior constable had the "great misfortune" of being sent to the complainant's house following a triple zero call.

He said Hawking had been looking to verify if the woman was injured.

Mr Mandy said the defence would argue her evidence was "inherently unreliable".

Jurors will be played a triple zero call from the woman about the break-in.

Mr Mandy said while the woman said her ex-partner had broken in and bashed her for hours, the CCTV vision would show a clear difference to what actually happened.

The court heard the accused policeman had denied touching the woman's nightie or dress and said he didn't touch her anywhere else.

He was told he would be asked to provide a DNA sample.

The court heard Hawking then explained and demonstrated in detail how he had touched her nightie in multiple places.

Mr Moore said it would be submitted he changed his story about touching the nightie.

The trial is set to continue in Wodonga on Thursday.

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