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The broached topic was the efficiency of public investment on decreasing crime rate in Brazil. The research problem was aimed at investigating what was the impact of public investment in police activities on the decreasing of homicide rates in the country. Using a quantitative design, four hypotheses were tested, involving the rate of inhabitants per police officer, the investment in policing, the investment in public security, and officers’ pay levels. All hypotheses were rejected, suggesting that public investment in security is not producing effective results.