This document analyzes the private security sector in Brazil, focusing on the motivations behind its growth and the regulatory framework. It discusses how private security responsibilities have shifted from the public to private sector due to economic incentives. This has led to significant changes in policing regulations and jurisdiction. The private security industry has grown linearly since 1969, especially in the 1990s, with more companies, guards, and electronic security technology. However, data on its size is limited and excludes illegal operations. The key drivers of growth are seen as increased crime, perceptions of violence and insecurity, and changes in urban development and public/private space usage.