Devolution of policing specifically was also a recommendation from the Commission on Devolution in Wales (the Silk Commission) established by the UK Government, which reported in 2014.
Hefyd, roedd datganoli plismona yn argymhelliad penodol gan y Comisiwn ar Ddatganoli yng Nghymru (Comisiwn Silk) a sefydlwyd gan Lywodraeth y DU, ac a gyflwynodd adroddiad yn 2014.