California Penal Code
Criminal law (also known as penal code) is the body of statutory and common law that deals with crime and the legal punishment of criminal offenses. This differs from civil law in that civil actions are disputes between two parties that are not of significant public concern.
The process begins with an alleged crime. A complainant makes an accusation, which is investigated by the police, acting as agents of the government. A formal charging document called a complaint or an indictment brought by a grand jury is filed with a court in the appropriate jurisdiction. If the offense is classified as a felony, the Fifth Amendment of the Constitution of the United States requires that a federal case be referred to a grand jury for an indictment.
The interests of the state are represented by a prosecuting attorney, while the interests of the defendant are represented by his defense attorney or by the defendant as pro se, acting as his own attorney. The Sixth Amendment of the Constitution of the United States guarantees a criminal defendant the right to a speedy and public trial, in both state and federal courts, by an impartial jury of the State and district wherein the crime was committed, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the assistance of Counsel for his defence.
While the specific process varies according to the local law, the process culminates with a jury trial (as required by the Sixth Amendment), followed by mandatory or discretionary appeals to higher courts.
Criminal statutes spell out the exact circumstances which constitute a crime. These circumstances are known as the elements of the offense. Unless all the elements are proven by the prosecuting authority, the defendant is not guilty of the offense. There are three kinds of elements: the act itself, the actus reus, guilty act; the requisite mental state, the mens rea, guilty mind; and the attendant circumstances. As an example, the common law definition of burglary was as follows: unlawful entry into a dwelling house at night with the intent to commit a felony therein. It is the duty of the prosecution therefore, to prove not merely the act (unlawful entry), and the mental state (the intent to commit a crime therein), but all the attendant circumstances (that it was a dwelling house, and that it was at night). Most modern criminal statutes have modified the elements, changing the “dwelling house” to a more general structure, and eliminating the “at night” element..
In defense, the accused could argue that he had no intent to commit a crime inside the house, that it occurred during the day, or that his entry was lawful. He could also, of course, argue that the incident never happened, or that someone else committed the offense.
Criminal law in most jurisdictions, both in the common and civil law traditions, is divided into two fields:
Criminal procedure regulates the process for addressing violations of criminal law
Substantive criminal law details the definition of, and punishments for, various crimes.
Criminal law distinguishes crimes from civil wrongs such as tort or breach of contract. Criminal law has been seen as a system of regulating the behavior of individuals and groups in relation to societal norms whereas civil law is aimed primarily at the relationship between private individuals and their rights and obligations under the law.