Ans: Understanding our criminal justice system includes the role played by the different professionals to deliver justice to the victim without getting influenced by various prejudices. So, separation of power is needed because absolute power can lead to unfairness. RoleFunctionsPolice Records the statement of the witnesses.Take photographs of the crime scene. Arrests the accused based on certain evidence.Get a medical examination if required. Public ProsecutorCross-check the statements of the witnesses. Brings an argument in favour of the victim.Defence LawyerMeet and get to know about the side of the accused person.Cross examines the witnesses in court. JudgeListens to the statement of witnesses.Records all the evidence.Decide the case on the basis of everything. Writes the judgement.Decides the conviction or acquittal for the accused. Passes the judgement.Conducts a fair trial.