The criminal justice system in the U.S. has three main components: law enforcement (police), courts, and corrections. Police are responsible for enforcing laws and maintaining peace. They fall under federal, state, or local jurisdictions. Courts determine guilt or innocence and impose appropriate sentences. The U.S. and each state have court systems with different levels like supreme courts and trial courts. Corrections oversees prisons, jails, parole and probation to punish and rehabilitate criminals. It also has federal, state and local divisions.