As a father, I have come to appreciate Shakespeare’s Henry IV more and more; particularly more than I did when I was only a son. Part of the play deals with how Henry IV got his crown, by deposing Richard II and the battles he had to fight to keep it. But a large part of the play deals with his riotous son, Hal, drinking and philandering with Falstaff before he grew into the great monarch Henry V. With that in mind, we continue our exploration of the Six Principles of an Adequate Procedures compliance defense with a look at Principle IV – Due Diligence.