Without a set of moral guidelines, a criminal justice system cannot accurately meet its populations needs. The systems job is to punish bad behavior and ensure that crime victims are appropriately compensated for their losses, whether that means providing restitution for financial damage or giving them the peace of mind that their attackers, abusers, deceivers and other criminals have been safely removed from society. Ethics are important in such a system because they provide both the accused and the victim with balanced application of justice.
This assignment is to focus on the ethics in the courts.  You can focus on defense attorneys and prosecutors. This assignments focus is not on police officer ethics, it is courtroom ethics.