Person of Interest/Recap/S01 E18

Season 1, Episode 18:

Identity Crisis
Reese and Finch are thrown for a loop when the latest number, Jordan Hester, winds up being the victim of an identity theft. Of the two people who could be their person of interest -- a barman or a lady who deals in antiques -- they have to figure out which is the real Jordan Hester and which is the imposter. At first it seems the man is the fraud and the leader of a drug production ring, but when Fusco investigates a previous victim of the same criminal he learns that it's the woman who runs the drug ring, and the man is trying to get to the bottom of who stole his identity. With help from Fusco, Reese and Finch manages to get the real identity thief arrested

Meanwhile, Carter is approached by Agent Donnelly of the FBI, who has been investigating the "man in the nice suit" who intervened on behalf of Powell after the congressman's assassination. He knows that Reese was once a black-ops officer for the CIA but believes that now he's selling his services to the criminal element of New York, such as Elias. Donnelly wants to get Reese off the street and maybe get evidence of CIA wrongdoings on American soil, and he offers the resources of his FBI task force to help Carter track Reese down, but she decides not to tell Donnelly what she knows.

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Tropes present in this episode include

 * The Atoner / Dude, Where's My Respect?: Fusco is making a genuine effort to turn his life around and be a good person, and is annoyed that Reese, Finch and everyone else only see him as a Dirty Cop.
 * Continuity Nod: Donnelly (who first appeared in "Root Cause") references many of Reese's actions in previous episodes, albeit a bit out of context.
 * Mushroom Samba: Finch is doped on ecstacy to keep him from making trouble. It's hilarious.
 * Prophecy Twist: The number, Jordan Hester, is both victim and perpetrator because they're actually two people and one is planning to kill the other.
 * Inspector Javert: Donnelly takes Carter's place as the well-intentioned law enforcement officer trying to catch Reese. The reason he's this trope and not a Sympathetic Inspector Antagonist is because he's got the wrong idea about Reese and thinks he's trying to bring in an insane black-ops hitman working for the mob.
 * Slipping a Mickey
 * To Be Lawful or Good: Again, a major dilemma for Carter.