Final answer:
The subject of this question is Law. It discusses the use of disciplinary investigative files after summary punishment, specifically addressing the time limit for their use.
Step-by-step explanation:
The subject of this question is Law. The question is discussing the use of completed, inactive disciplinary investigative files in subsequent disciplinary or adverse personnel matters. The specific time limit addressed in the question is the number of years after a summary punishment was issued that these files can be used, unless required by law.