Management matters for firms, but what practices are optimal in hierarchical government organizations? And can skilled managers identify them? A large-scale randomized trial conducted with the police of Rajasthan, India, tested four interventions recommended by senior police officers: limitations of transfers, rotation of duties and days off, increased community involvement, and on-duty training. Field experience motivated a fifth intervention: “decoy” visits by enumerators to register cases, incentivizing staff to improve service. Only training and decoy visits had robust impacts; others were poorly implemented and ineffective. Management reforms can improve policing, but even skilled leaders struggle to identify the optimal interventions.