Mandates,Geography, and Networks: Diffusion of Criminal Procedure Reform in Mexico

Why have some Mexican states proceeded faster than others in the revolutionary transformation of overhauling criminal procedure? Contributing an original index of criminal procedure reform across Mexico's 32 states from 2002 to 2011 and building on existing research on policy diffusion, this article seeks to answer this question. It finds that the 2008 constitutional reform at the federal level exerts a strong positive effect (federal mandate); being situated in a neighborhood of states that have reformed has a counterintuitive negative effect (spatial proximity); and having a governor from the same party as governors of other states that have reformed has a positive influence (network affinity). These findings yield a better understanding of the vertical, cross‐level and horizontal, cross‐unit diffusion of reform, with implications for understanding how to overcome challenges to criminal justice reform in Mexico, Latin America, and elsewhere.