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Currently you are able to watch "In the Line of Duty 4" streaming on Vidio for free with ads or buy it as download on Apple TV. It is also possible to rent "In the Line of Duty 4" on Apple TV online
Two detectives who are up to their necks in trouble and in each other's face, as they try to shut down a drug-trafficking scheme that could be connected with international ties to organized crime. But in the midst of their investigation, innocent immigrant dock worker Luk Wan-Ting gets caught up in the mix when he witnesses the murder of an intelligence operative and is framed for the crime.