The first three seasons contain infrequent violence, mostly just people getting punched, shot with little blood, and one scene of a man's arm getting shot with some blood splatter against a wall. Season 4, 5 and 6 ramp up the violence where shootouts result in more blood spray, most notably someone getting shot in the stomach with blood splattering all over the camera, someone getting shot in the neck with some blood splatter.
Season 3 is easily the weakest in terms of violence. One man has an attack and collapses after being poisoned by pills, a man is beaten off screen and a finger is pierced briefly by a needle.
Bloody violence in Season 4, 5 and 6. Especially season 6 having the most frequent violence of the whole series.
Season 6 had more shootings as the story starts not becoming about court cases anymore.
The first 9 episodes of season 6 contain some bloody imagery, violence and even some shootings with some blood on the floor. More violence than the earlier seasons but still much more tame than Breaking Bad.
Overall, less violent than Breaking Bad. While never graphic, it is very intense at times.
First three seasons don't contain much violent content.
Nowhere near as violent or gory as Breaking Bad but some scenes can be quite brutal.
A man's face is sliced with blood splatter his leg is then chopped off with an axe off screen. The man's then shown laying there, we see his severe leg with lots of blood.
TV-MA violence type: blood and brutal.
A video shows two teenage boys holding the severed head of an elderly corpse in a morgue. It's then implied the teens have sex with the head.
The last 3 seasons have pretty bloody shootouts