Internal affairs investigators should be assigned with the intention of the assignment being a career, not just a tour of duty. Short term investigators are not ideal in any department. There are investigators in police work that specialize in certain criminal acts. This should not be any different with internal affairs.
There is a trend towards combining training and internal affairs. The reasoning behind this is that internal affairs investigations reveal inadequate policies and training. What better way to accomplish both missions in one position? So, what is the answer to "Why IA?" In this day and world, we must hold our officers to a higher standard. It is the job of each administrator to appoint someone to the position that will uncover facts and fallacies of the department's practices. The findings will be reported by a competent investigator who knows the process and the need for doing it.