Final answer:
The criminal justice system is designed exclusively for use by criminal justice agencies. It includes the police, the courts, and the corrections system, all functioning to enforce legal codes and implement justice.
Step-by-step explanation:
The blank in the question "________ is designed exclusively for use by criminal justice agencies conducting their lawfully authorized duties." should be filled with "criminal justice system." This system is structured to enforce legal codes and consists of various agencies, including police, the courts, and corrections system. Each branch plays a role in the overarching justice process, from law enforcement and crime prevention by the police to the adjudication of cases by the courts and the eventual confinement and rehabilitation in corrections institutions.