View our selection of criminal law books, spanning a comprehensive range of offenses. Criminal law, also referred to as penal law, is the most punitive area of law in the United States. It has a complex system of rules and regulations that attempt to preserve order in our society. Criminal law is enforced solely by the government, either at the state level or federal level. Our criminal law books and case studies include possession or distribution of a controlled substance, child abuse or pornography, assault and battery, burglary and murder.