Professional Responsibility involves the study of the lawyer's trifecta of duties: to the client, to the courts, and to the public. The topic covers organization of the legal profession, fees, conflicts of interest, confidentiality, advertising and solicitation, unauthorized practice, courtroom conduct, and a variety of other areas related to ethics in the legal profession. Professional Responsibility is a required course at MU Law. The Missouri Bar requires all Missouri lawyers to take the Multistate Professional Responsibility Exam (MPRE) & to complete at least three hours of ethics CLE annually. See the MPRE tab above for more details about the exam. See Missouri Supreme Court Rule 15.05 for information about CLE requirements or The Missouri Bar for MoBarCLE courses on Ethics.
The ABA Model rules are a set of model rules and commentaries on the ethical and professional responsibilities of members of the legal profession. Each state has codified its own version of the ABA model rules.
In Missouri, The Office of Chief Disciplinary Counsel investigates attorney misconduct.
Model Rules of Professional Conduct by 
Missouri Court Rules- State, Federal and Circuit Courts (v.1-3)
Annotated Model Rules of Professional Conduct by