Like most of California’s codes, the Penal Code is divided into parts, with the Penal Code containing six, most of which contain titles, some of which are in turn subdivided into chapters, with individual sections comprising the smallest unit of content. Unlike sections of the United States Code, any particular provision of the Penal Code is usually referenced by its section number alone, especially when a police officer in the state refers to a particular criminal act over their radio. Most of this article deals exclusively with the substantive criminal law set out in Part 1.