Findmypast has put several collections of Irish police records online.
The following information comes from Findmypast:
Irish Revenue Police, 1830-1857
[This collection] contains over 37,000 records that list the details of men who served with the Irish Revenue police between 1830 and 1857. The Irish Revenue Police were formed to work with the Customs and Excise Service to prohibit illegal distillation or liquors and spirits or poteen (poitín) making.
Each record consists of a transcript and a scanned image of the original document held at The National Archives in Kew, London. Transcripts will include a combination of your ancestors name, station or address and the date the records was taken. Images will provide further particulars about your ancestor.
There are various types of documents available to view such as lists of new appointments, which will give you the date of your ancestor’s appointment, which corps he was assigned to and who appointed him. Minutes of appointments, which recorded transfers of privates between stations or parties and dismissal records are also included.
Royal Irish Constabulary (RIC) pensions 1873-1925
[This collection] contains over 112,000 records. The RIC was the armed police force of the United Kingdom in Ireland from the early nineteenth century until 1922. The force was responsible for keeping the peace through the detection and prevention of crime and suppressing rebellions and agrarian disturbances.
They enforced laws related to food, drugs and fishery and took over the duties of the Irish Revenue Police, which had previously enforced the laws against whiskey production. In areas that lacked a fire brigade, they were also called upon to stop the spread of fires.
This unique collection comes from The National Archives in Kew and consists of the records for pensions and allowances given to officers, men and staff of the RIC and their widows and children. The collection includes registers of pensions along with registers of deceased pensioners and pensions paid when the RIC was disbanded in August 1922.
Many of the records show whether the individual paid into the Constabulary Force Fund. This fund, which was formerly called the Reward Fund, was used to reward RIC members monetarily after acts of achievement and/or bravery. For example, in July 1875, Constable John Daly was awarded £6 for gathering evidence by visiting infected houses and families. The evidence gathered was sufficient to arrest a swindler doctor.
Royal Irish Constabulary History & Directories
[This collection] contains over 1,670 pages from 6 different publications printed between 1871 and 1920 that provide further insight into the daily operations of the police force and the history of the organisation. Included is a history of the force, lists and directories for 1889, 1915, 1918 and 1920 and The Royal Irish Constabulary Guide to the Discharge of Police Duties.