Empirical investigations of social control mechanisms are often limited to single sources of control, such as the efficacy of legal punishments. Because research has produced only moderate support for the hypothesis that perceived risk of legal punishments reduces the likelihood of nonconformity, some have searched sources of control that condition this relationship. such as the degree of moral condemnation individuals hold toward a criminal/delinquent act. However, relevant research has resulted in contradictory findings. Using cross-sectional and panel data, we obtained results that show that moral condemnation of an act conditions the deterrent relationship and that findings from previous studies may have underestimated the effect of legal deterrents given the presence of those in the population who refrain from marijuana use because it is believed to be sin fur. Implications of the findings for the relative deterrability of serious versus minor offenses and the relevance of this distinction for issues of social control are discussed.