There are many scenes throughout the entire show of people being shot, often at point blank range.
Season 1 :
A man is shot in the chest several times. We see his dead body numerous times. There's a lot of drama following this.
A man shoots himself in the head accidentally. We see him lying on the floor as he bleeds out and dies.
A man is shot in the stomach from a distance. We see the man with his shirt soaked with blood afterwards.
A man beats another man to death with a piece of metal in a sock. It's off screen, but after the beating we see the bloodied man.
A man is attacked by a gang of men. They hit him with baseball bats, spray him in the eyes with pepper spray and then force him into a van where he is held at gun point. There is no blood and they let the man go.
A man is shot twice in the back(on screen) and once in the chest(off screen) in front of his wife and kids. We later find out that he died.
A woman is beaten by her boyfriend. This is off screen but very intense and disturbing. We see her covered in bruises and cuts.
A man is attacked outside his house by another man with a baton. He beats him to the ground. Blood pours out of the man's mouth.
A man is punched in the face(aggressively) several times(off screen)
A man is shot several times in the back by a drive-by. We see him lie on the floor as he begins to bleed out.