Sally Brown, pictured, is accused of sexually assaulting a policeman after he tried to give her a breathalyser test

A woman motorist grabbed the crotch of a policeman and offered him sexual favours when he gave her a breath test, a jury heard.

Sally Brown, 39, was stopped by the young constable in the early hours of the morning, a court heard.

As he was explaining to her how to use the breathalyser kit she told him: ‘I will blow you’, it was alleged.

York Crown Court was told three police officers, including the complainant were in a vehicle in Scarborough, North Yorkshire, at 4.14am on February 28 this year.

Prosecutor Mehran Nassiri said: ‘They came across a Suzuki Swift driving in front of them.

‘The manner of the driving caused the officers to stop the vehicle and they formed the view Miss Brown was under the influence.

‘They invited her to provide a roadside sample. The equipment was not calibrated. So other equipment was brought.

‘The PC was explaining she had to blow into the tube and she said ‘I will blow you’ - and grabbed the officer by the crotch.’

The officer, who cannot be named, said they stopped Brown and her male passenger after she nearly crashed into a parked car.

He continued: ‘Miss Brown was sitting in the driver’s side. The driver’s door was open. I was standing between Miss Brown and the gap in the door.

‘Miss Brown was quite loud. She was joking. She said she had had a pint so what? She found the process quite funny.

‘I said it was the same a blowing up a balloon - not too hard and not too slow.

‘I felt something touch my crotch. It was followed by a phrase from Miss Brown: “I will blow you”.

Judge Paul Batty QC then said: ‘Don’t be shy officer. What did she actually do?’

The officer replied: ‘She placed a hand over my genitals. It was a split second - a motion downwards.

Brown, pictured, has admitted drink driving but denies sexually assaulting the officer

‘I immediately told her to keep her hands to herself. With my hand I motioned her hand away.

‘It was not a grab in a sense of a hold.’

Adjourning the case until tomorrow the judge quipped to the jury: I’m tempted to say we will leave it there until tomorrow.’

Brown, of Cayton, Scarborough, has admitted drink driving but denies sexually assaulting a man.

The court heard after being arrested for the offences she told police she could not remember what had happened.