Watch Chicago PD Online: Season 5 Episode 21Paul Dailly at .
Was it possible to stop military grade weapons from hitting the street?
Halstead and Atwater tried to find out on Chicago PD Season 5 Episode 21 when they realized there was a chance someone could be gearing up for a war against the police.
Meanwhile, Voight called in a favor when it became apparent that Olinsky was going away for Bingham's murder.
Did the favor allow Olinsky to walk free, or was it too late for him?
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.