A number of theories attempt to explain the elements of the decision making process when one is faced with an ethical dilemma. Trevino's model (1986)posited a main effect of cognitive moral development (CMD) on ethical behavior, moderated by reinforcement contingencies. Past research has failed to examine the full spectrum of reinforcement contingencies: rewarding ethical behavior (RE), punishing unethical behavior (PU), rewarding unethical behavior (RU), and punishing ethical behavior (PE). It was hypothesized that RE and PU would encourage ethical behavior, while RU and PE would encourage unethical behavior. An additional hypothesis that has not been examined is that reinforcement contingencies would cause individuals who are at the conventional level of CMD to regress to earlier stages of moral reasoning. Support for these hypotheses was not found. Possible explanations for the results are discussed, including the nature of the task itself.