Old post here, but this is one of my pet peeves. Declaring "its fiction, relax" is an terribly weak bit of justification. GOOD fiction requires that the world in a fictional story remain as close to real norms as it can except for the areas that are specifically intended to depart. This is most obvious in science fiction or fantasy, where the world and people should be normal except where the fantastic elements intervene. However, it applies to less fantastic fiction as well.
I'm sure that different departments in different cities operate differently. We can make that assumption on the Closer and Major Crimes. However, even these shows, on occasion, have noted through dialogue that the Priority Homicide/Major Crime units are "lieutenant heavy." This can be attributed that the unit is intended to be "high profile."
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