Wrexham Magistrates Court heard how Pc Christopher Davies, 27, had sent the 15-year-old girl hundreds of text messages but he insisted none had been of a indecent nature.

The hearing was told that Mr Davies, who was and officer with North Wales Police, met the teenager - who cannot be named - when he interviewed her about claims she had been assaulted at a leisure centre.

"There was uncorroborated evidence from one witness as to the content of the text messages, which we did not find compelling

Chairman of the bench Judy Barlow

Going against police regulations, he said he passed on his personal mobile phone number to the girl so she could contact him if she encountered any further trouble.

Over the subsequent two months, the two corresponded around 800 times.

But the teenager alleged that what started out as innocent degenerated into Mr Davies asking her if she would perform a sexual act on him.

Mr Davies, from Northop Hall near Mold, north Wales, denied six charges of sending grossly offensive or indecent messages.

Chairman of the bench Judy Barlow said: "It was a factual issue at dispute as to the content of the text messages.

Some of the messages were sent late at night

"On examination, we find the prosecution's evidence confused and contradictory and felt that it did not meet the standard required.

"There was uncorroborated evidence from one witness as to the content of the text messages, which we did not find compelling.

"Therefore we cannot be satisfied beyond reasonable doubt that such messages were sent."

Matthew Dunford, prosecuting, had told the court: "This defendant abused his position of trust and authority by sending these messages to a vulnerable young person when he should have known better."

Defending his behaviour, Mr Davies said he had given his mobile number to 70 or 80 other people.

"Officers are taught the correct way of doing things but once you come out of the training school we each find a way we believe is the easiest way to deal with the job," he told the court.

"If we did everything by the book we wouldn't be able to do any proactive policing at all."

But, he admitted, he had texted the teenager late at night and looking back he said his behaviour had been "naive".

Shortly after his arrest in February last year, Mr Davies was suspended from this job of four years.

He must now await a decision on whether an internal misconduct hearing is to be held.