A criminal justice lawyer specializes in the system of criminal law that is used by the government. The government uses the criminal justice system for preservation of social control. The government also uses this system for law enforcement and administration of justice. The criminal justice process is taken care of through a number of steps. However, the process in which the criminal justice is involved varies from one state to another. The best criminal lawyer in this field must have expertise in the steps through which the criminal justice process goes.