This paper examines the impact of Lei Seca Operations on crime deterrence in Rio de Janeiro, Brazil. Utilizing a quasi-experimental design, we analyze the effect of increased police presence, specifically through Lei Seca blitzes, on the occurrence of shootings. We explore the spatial and temporal dynamics of crime in relation to police interventions by leveraging geographical data of Lei Seca Checkpoints and armed shootings in the Rio de Janeiro State area. Our findings indicate that the presence of Lei Seca Operations does not significantly reduce the probability of shootings within 100, 500, or 1000 meters from the operation points. These results suggest that certain types of policing, even those not directly aimed at crime deterrence, may not effectively influence criminal activity in specific contexts. This study highlights the importance of tailored policing strategies and the need for further research into the interaction between different forms of police presence and various types of crimes.