Chin Check - S1-E3
Factual error: The cops raid a house and find some rifle ammunition. The female cop says "cop killers." A few seconds later three cops are looking at the bullet and a box used to store it, it appears to be a 5.56x45mm round used in the AR-15 style rifles. All high powered rifle ammunition, doesn't matter if its bullet is fmj or armor piercing will go through soft armor which is what all police officers wear. Such ammo is available to civilians in every store. All rifle ammo could be considered "cop killer." (00:03:50 - 00:04:56)
Climbing Into Bed; You Never Know Who's Who - S3-E5
Factual error: S3/E6: You Never Know Who's Who - Lindsey is searching a dark house with her weapon and flashlight. Her hands are in the wrong position. Her hand with the weapon should be above her hand with the flashlight, because if she fires her weapon the slide will hit her hand with the flashlight and jam or injure her hand. (00:04:48)
Factual error: When Detective Olinsky calls out a license plate to Detective Upton he uses the wrong police phonetic alphabet. He uses the word Andy for A instead of "Adam", as is used by Chicago police. (00:35:00)
Factual error: Adam is shot, and Kim responds to give him aid. Kim has her firearm out, searching and asking Adam, "where is he?" Instead of holstering her firearm, she tossed it aside to help Adam. Her action is not in accordance with law enforcement training. (00:36:17)
Factual error: Kevin sleeps overnight at woman's apartment. He doesn't share that he's a cop. The next morning in his unmarked police vehicle he uses his handheld radio that was appeared to be stored in the console and shows up on a violent scene with his weapon. It's obvious that Kevin used his official vehicle for personal reasons, and stored his radio and weapon in the vehicle unprotected overnight, which every police officer knows is wrong and a violation. (00:03:53 - 00:04:29)
Answer: Because he is a great cop and gets the job done better than anyone.