 There are links between NPOIU, ACPO, National Domestic Extremism Unit (NDEU), National Extremism Tactical Co-ordination Unit (NETCU) and the Welsh Extremism and Counter Terrorism Unit (WECTU).Because the ACPO is a private limited company rather than a public body, it is exempt from public accountability, including freedom of information laws, even though it was funded by the Home Office and deploys police officers from regional forces.Established in March 1999, the NPOIU incorporated the Animal Rights National Index, work that had previously been the responsibility of the various Special Branches.