Ruzek is getting vital intel from a an ex-cop thats down on his luck, but little did he know that his source of intel was the main suspect pulling the strings behind a massive drug network.

Season 5 Episode 9 "Monster"
The Intelligence unit investigates a string of opioid overdoses, one of the victims is the daughter of a well respected Chicago judge. The deaths lead to an epidemic when it spreads into family neighborhoods. Meanwhile, Ruzek continues to get blackmailed by Lieutenant Woods into finding dirt on Voight to take him down.

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