Ability to: research, analyze and apply legal principles, facts, evidence and precedents to legal problems; establish and maintain effective working relationships with staff members, departmental representatives, county officials, the courts, law enforcement agency officials, and the general public; understand and accept differences in human behavior, and cultural and ethnic backgrounds. Knowledge of: the duties, powers, limitations, and authorities of the Office of the District Attorney; the principles of civil or criminal law, principles of trial procedure, and rules of evidence; legal research methods and judicial procedures; written and oral communications, including language mechanics, syntax and English composition.