Advertisement National Investigation Agency (NIA) Recruitment.Last Date: 60 Days. National Investigation Agency (NIA) has released 2 notifications for the recruitment of 17 DySP, Expert, Assistant and other vacancies at various locations including Guwahati on absorption/ deputation basis. National Investigation Agency (NIA) Recruitment 2020 1. Deputy Superintendent of Police (Dy SP)No of posts: 7 Posts [5 Posts for deputation/ absorption basis