This book brings together the results of research aimed at investigating the inclusion of psychology in the field of public security, by analysing the practices actually carried out by psychologists. The Civil Police of the state of Rio de Janeiro was chosen as the institution to be studied, with the aim of studying the practices carried out by psychologists as members of the police force, through interviews. Working from the epistemological-methodological perspective of cartography as a process of investigation in the social sciences, results were achieved at the institutional level and at the scientific level, both characterised by an almost total lack of articulation between the sciences of psychology and law. The final discussion of the results was carried out using concepts from socio-anthropology (LATOUR, 2013) and the theoretical framework of schizoanalysis (DELEUZE & GUATTARI, 1995/2000). The discussion of the results points towards future research and possible scientific-professional interconnections. It is recommended reading for all those who study or experience the phenomena related to public security in Rio de Janeiro.