We see a character's brother brutally beaten after having been in prison for quite a time - pretty graphic wound depiction
R-rated violence throughout the movie the beginning montage (in which we see dead victims).
We see the dead body of a drug dealer in the beginning during the investigation.
Graphic police brutality in the opening scene
We see a scene of a guy threatening to put a cigarette in a kid's eye (disturbing).
We see that same drug lord destroy the guy's car. Lots of damage.
We also see another dead guy's body later on (graphic somewhat, but not very detailed).