18% of crimes reported to Gardaí in 2011 do not appear to have been recorded on the PULSE computer system.
A review carried out by the CSO into the quality of Garda crime data has also found that 3 per cent of crimes recorded that year were incorrectly classified in the wrong crime category.
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And 7% classified in a 'non crime' category should have been classified as a crime.
The review was carried out following a Garda Inspectorate report last November, which highlighted systemic failures in how crimes were recorded on PULSE.