This chapter explains the basic constitutional and legal concepts with which forensic psychologists need to become familiar. Whether the matters are criminal or civil, family or juvenile, forensic psychology can be defined as work in, of, and for the courts. An understanding of the contents of at least the first three of the articles of U.S. Constitution and a few of the amendments is imperative for an appreciation of how the law works, which in turn is critical for those who would be working with, for, and in legal environments. The chapter explains the case of Griswold v. Connecticut, one of the first cases addressing privacy among consenting adults that the U.S. Supreme Court decided, for several reasons. The case represents the zeitgeist of the State of Connecticut and much of the United States through the middle of the 20th century, and explains the process of case briefing.