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"Negative Pressure" is the fourth episode in Series 3 of Line of Duty and the fifteenth overall episode. It was first broadcast on BBC Two on 14th April 2016.

Summary[]

Fresh testimony launches AC-12 back on the trail of the Caddy, a corrupt officer with links to organised crime. But new disturbing evidence suggests the Caddy may reside within AC-12. 

Recap[]

Part I[]

Main article: Negative Pressure Recap Part I

Part II[]

Main article: Negative Pressure Recap Part II
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