Question: In the wake of the bioterror attacks, how come we didn't see the FBI get involved with the investigation and subsequent manhunt? Also, with the bioterrorist finally located, how come the SWAT team wasn't called in to spearhead the takedown? In real life, the FBI's Hostage Rescue Team would most likely be the ones to go in after a terrorist.
Question: If Voight's a dirty cop and everyone knows it why tolerate it? Why not set up a sting and take him down?
Answer: Also, if you watch Season 1 of Chicago Fire it gives a little history of Voight before he goes to jail when he was actually a "dirty cop" and Antonio Dawson is actually the one who takes him down. I found it interesting and was surprised by his character back then.
Answer: And cuz he's only dirty to the bad guys. He takes care of the victims.
Answer: Because he is a great cop and gets the job done better than anyone.