This study examines whether deterrence and morality interact in the explanation of adolescent offending. On the basis of the Situational Action Theory, the author hypothesizes that deterrence is more effective in preventing offending among individuals with low levels of morality than among individuals with high levels of morality. To test this hypothesis, self-report data are used from a sample of young adolescents in Halmstad, Sweden (N = 891). The findings provide strong support for the hypothesis that the effect of deterrence (measured as the perceived risk of getting caught, that is, "certainty") on offending is dependent on the individual’s level of morality, indicating that deterrence has a significantly stronger effect on offending for individuals with low levels of morality than for individuals with higher levels of morality.