The first work, authored by Luís Felipe Zilli, deals with the phenomenon of violence involving police officers. In the study, originally published in December 2018, the author analyzes data from previous years on deaths resulting from police interventions and police officers killed in three Brazilian states – Minas Gerais, Pernambuco, and Goiás. As indicated in the addendum, certain trends that were already evident in the original study were accentuated in the following years.