Citizen views are, at times, in opposition to professional expertise. When it comes to policing, discussions surrounding the use of force often indicate a lack of understanding from the general population. In this study, police ( n = 1609) and social sciences ( n = 688) students were shown a video vignette of a fatal police shooting. Findings show that police students’ attitudes towards the use of force face a significant shift during training, leading to stronger support for lethal force and greater discrepancy in opinions compared to the other students. Our results also show that non-expert adults want police officers to be sanctioned severely.