A report to be published this afternoon will accuse Gardaí of massaging national figures on crime.
The report from the Garda Inspectorate, set to be published at 4pm, will claim that gardaí downgrade the significance of some crimes, because of a lack of clear guidelines.
The report is said to have also found evidence that gardaí sometimes fail to act on reports of crime, with claims that reports of domestic violence are ignored, while other incidents are not recorded on the Pulse computer system.
Acting Garda Commissioner Noirin O'Sullivan is refusing to comment until the report is made public, but says the force will deal with any challenges that arise.
"There are several challenges facing An Garda Síochána, not just today, but we're meeting those challenges head on," she said.
"The men and women of An Garda Síochána are very focused on continuing to provide a policing service to the people of Ireland that the people of Ireland can be proud of, and we're very determined to be accountable to the people of Ireland for the policing service that we provide."