Archibald attempts to find variables that can explain the variation not only in the adoption of the death penalty, but also in the implementation of capital punishment. She combines Kingdon's Garbage Can model and Social Control Theory to explain the differences in the adoption and implementation of the death penalty. Given that there was only one model that showed a correlation between the adoption and implementation of the death penalty and homicide rates, while other variables, such as race and hate crimes, were correlated across multiple models, one could argue that the death penalty is used as a means of social control. Her results also bolster the argument that state policies are not merely reactions to murder rates, but are influenced by other sociological, political, and economic factors.