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The victim would not get justice if only one person performs all the functions of the criminal justice system, because he could get influenced by various prejudices. Separation of power is necessary for within a judicial system too, since absolute power can lead to unfairness.
Two reasons why different people need to play different roles as part of the criminal justice system are:
Because all the aspects of trial and investigation cannot be conducted by a single person, as it entails a diverse range of work including arresting, recording the statements of witnesses, defending the victim and accused parties, passing a fair trial and judicially correct judgement.
Because if all the powers are vested on one person alone, it might be misused and thereby violate the laws based on just and equal decision.
A single ideology may not be the right one, as it can affect the trial and the result of the case.
