Bloody bodies and facial disfigurement at black site
Season 2 includes executions, throat slicings, significant combat gunfire, torture, and stabbings
Lots of action/violence throughout the entire show, mostly consisting of shootings with blood spurts. There is at least one gunfight or chase in each episode. Majority of the violence isn't overly graphic, by the some scenes do get bloody and/or disturbing.
Jack stabs a guy in the eye with a pen not too violent but can be disturbing for some people
Season 1 and 2 have very strong, gory bloody violence but season 3 has less strong and gory violence.
A man enters a hospital saying he is sick and then graphically vomits