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A severe accident by a Detective's son makes Casey a target for Detective Voight, as Casey refuses to change the statement have gave for the scene. While Casey is now under almost constant surveillance by the Detective he sticks to his guns and the Chief stands by him.
Severide's neck injury turns out to be a spinal injury, and without any kind of surgery he could permanently injury him.However, Severide is unwilling to do the surgery out of fear of losing his job.
Meanwhile, Mills introduces the station to his mother and sister.