This document summarizes key concepts from a business law textbook chapter on criminal law: 1) It defines the three elements of a crime as a duty, an act or omission in violation of that duty, and criminal intent. It also discusses types of criminal intent and crimes. 2) It outlines various rights that people have when arrested, such as the right to remain silent. It also discusses how people can be liable for the criminal actions of others. 3) The document concludes by explaining common defenses to criminal charges, including procedural defenses regarding evidence and substantive defenses like self-defense or insanity. It provides examples of each type of defense.