Under section 33 of the Policing, Security and Community Safety Act 2024 the Garda Commissioner is responsible for the management and administration of Garda business, which includes all internal HR matters, such as decisions regarding promotions. Furthermore, under section 34(1) of the same Act, the Garda Commissioner is independent in the performance of his functions.
I am informed by An Garda Síochána that the role of "Detective" is a duty type rather than a designated rank. In 2024 there was one member who was a Detective Inspector and who retained the duty type of “Detective” when promoted to Superintendent. There have been no such promotions to date in 2025.