Who was manufacturing "cop killer" machine guns?
On Chicago PD Season 6 Episode 14, the team traveled to Wisconsin when crimes against cops continued to spike.
The aim of the mission was to find those responsible for this new breed of guns that were doing the rounds.
Things got awkward on the mission because Burgess and Upton were tasked with going undercover together.
However, Burgess and had just learned that Upton was dating Ruzek and it meant there was a dark cloud hanging over the trip.
Did they manage to air their thoughts on the matter in a constructive way?
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.