Chief constable Richard Brunstrom will not face criminal charges after a 13-year-old sexual abuse victim was named in a North Wales Police report.
Richard Brunstrom will not face criminal charges
The Crown Prosecution Service (CPS) said there was "insufficient evidence" to support a case against him.
But an investigation by the Independent Police Complaints Commission could still recommend disciplinary action.
An inquiry was launched after the girl, who was groomed by a paedophile, was identified in a report last September.
She was named in the chief constable's Police Authority report - despite sex attack victims being entitled to anonymity.
Police became aware of the blunder after copies of an agenda were distributed to press and public in September. 2 The force's assistant chief constable Ian Shannon issued an immediate apology after the mistake was highlighted by a journalist.
Everyone who received a copy was ordered to destroy it and the IPCC launched an investigation, amid concerns the error could have constituted contempt of court.
But a spokeswoman for the CPS confirmed they believe there is "insufficient evidence for a prosecution against Mr Brunstrom."
A North Wales Police spokeswoman said: "We can confirm that no action is being taken.
"The identity of the individual never reached the public domain and we have reviewed our procedures in preparing these types of reports."
It is believed the CPS felt there was insufficient evidence over who was ultimately responsible for publishing the report.
Although criminal charges have been ruled out, an investigation by the IPCC - which is due to conclude in the next few weeks - could still recommend disciplinary action.
An IPCC spokesman refused to comment on Mr Brunstrom's case, but confirmed: "We have the power to make recommendations."
The 13-year-old girl was targeted by drug-dealing paedophile Paul Thompson, who drove her from North Wales to Essex, where he had sex with her in a caravan.
He was jailed for three-and-a-half years last July, to run consecutively with a four-year sentence for drug-trafficking.