Police Scotland admits stop-search data 'not accurate'
Police Scotland's chief constable said the force had not wanted to release stop-and-search data because it was "not fit for public consumption".
Sir Stephen House told a special meeting of the police watchdog that he was forced to release the data to the BBC under freedom of information rules.
Scotland's Information Commissioner denied that this was the case.
BBC Scotland's story revealed police had not discontinued searching under-12s, as they had promised in June.
At the time, senior officers said they shared concerns about the capacity of younger children to give "informed consent" to be searched.
The Scottish Police Authority meeting was called after BBC Scotland reported that the data released by Police Scotland had shown 356 children aged under 12 had been subject to "consensual" searches, despite assurances from the force that the practice would cease.
The chief constable said: "I think the BBC reported it as accurately as they could do.
"But the data was not 100% accurate and needed further interpretation."
Sir Stephen said: "This information was released under the freedom of information act on the express instruction of the Freedom of Information Commissioner in Scotland.
"We challenged whether it should be released because we were not 100% certain of the accuracy, we wanted more time to work on it. We were told 'no, release it now'.
"It wasn't a consensual release, it was a legislation release."
Margaret Keyse, head of enforcement at the Scottish Information Commissioner's office, said it had not forced the police to release the data.
She told BBC Scotland: "The Commissioner did not make a formal decision, so it is inaccurate to say Police Scotland was compelled to disclose the information to you: it did so voluntarily."
The BBC was not told that the figures from the police were inaccurate when they were released.
It emerged during the meeting that the police force had also failed to tell the watchdog about its concerns over the data.
Senior officers blamed a "clunky" ICT system and problems with the recording of incidents for the inaccuracies.
By Marc Ellison, BBC Scotland data journalist
The acquisition of the 2014 stop-search data by BBC Scotland took many months, and was only finally released after an intervention by the Scottish Information Commissioner.
Chief Constable Sir Stephen House has now called the data "inaccurate" - data that should never have been released to the media.
In its defence, Police Scotland did acknowledge in mid-2014 that thousands of records had been corrupted.
In an October 2014 letter, the force stated that "the data assurance work is not due for completion until December 2014".
The stop-search data was finally received by BBC Scotland in mid-January 2014 - at which point no mention was made of any residual errors in the data.
The accompanying note only had one caveat - to disregard any ages outwith 1-90.
Friday's meeting between Police Scotland and the force watchdog has raised some alarming issues.
Firstly, that the stop-search database is a "clunky" and error-ridden system. This revelation will cast a long shadow, putting into doubt any further stop-search statistics released by the force.
Secondly - and perhaps more disturbingly - Police Scotland said they would not have volunteered the data, but were only compelled to by the Information Commissioner.
This could raise concerns over what data Police Scotland will willingly release through freedom of information laws in the future.
Assistant Chief Constable Nelson Telfer told the Scottish Police Authority analysis of the figures now suggested that only 18 of the searches had been contrary to force policy.
A number of searches had been carried out under legislative powers, while others had taken place when a parent or guardian was present.
He said IT problems with data collection meant many other incidents of consensual stop-searches of children had been incorrectly recorded.
The chief constable said IT problems had been identified before the data was released to the BBC.
Following questions on why the Scottish Police Authority was not made aware of the 18 searches until now, Sir Stephen said he accepted that Police Scotland "made mistakes".
Following the SPA meeting, Scottish Liberal Democrat leader Willie Rennie called for an independent audit of police stop-and-search figures.
Mr Rennie said: "This has reached such a level of farce that people will find it difficult to believe anything police high command are telling us.
"There are now major questions over their recording practices. It is nonsense to claim that the information commissioner compelled them to publish inaccurate figures. This requires an independent audit."
Sir Stephen had begun the meeting by calling for a non-partisan debate on the issue of stop-search powers.
He said the policy would continue to be an emotive issue.
A balance had to be struck between the rights of the individual and ensuring the community was kept safe, Sir Stephen said.
The police intend to consult on ending non-statutory or "consensual" stop-and-search for all age groups.
But they believe this will leave gaps in their ability to protect the public that must be filled.
Deputy Chief Constable Rose Fitzpatrick told the SPA meeting police have no powers to search young people for alcohol.
She said that was a "gap" which the force would like to see plugged.
She said just over a third of all consensual stop-searches were related to alcohol, about 40% of which were carried out on young people aged under 18.