One of a series of secondary level teaching units presenting case studies with pro and con analyses of particular legal problems, the document consists of a student's lesson plan, a teacher's lesson plan, and a lawyer's lesson plan for a unit about the enforcement of federal criminal regulatory statutes. The lesson plan presents an analysis of the questions a prosecutor has to weigh when considering whether a crime has been committed, who is to be charged, what the charge will be, and how to proceed with the prosecution of the case. Although similar in content, student and teacher lesson plans are presented separately to facilitate independent or small group work by students and to provide teachers with additional background information. Following a lawyer's visit to the classroom, students examine several cases to determine when a "gift" is a bribe. Subsequent sections present criminal case studies and analysis of the questions a prosecutor might face. A "walk through" mock trial illustrates how plea bargaining sessions between the prosecutor and defense probably would be carried out. A glossary, a brief reading on court systems, and a simplified view of federal and California court structures are included. The lawyer's lesson plan presents a more thorough discussion of cases, including thought-provoking questions for students. (LH)