Nor do they somehow have contractural agreements with their cities that limit civilian oversight and require that possible crimes by members have to be handled as internal disciplinary issues first.
Structurally this means evidence gathered by internal investigations will often be destroyed and can't be used for possible criminal charges, as well as plenty of time to tighten up stories and close ranks with each other.
Nor do they somehow have contractural agreements with their cities that limit civilian oversight and require that possible crimes by members have to be handled as internal disciplinary issues first.
Structurally this means evidence gathered by internal investigations will often be destroyed and can't be used for possible criminal charges, as well as plenty of time to tighten up stories and close ranks with each other.