S2, E6: Trying to let go of police work and return to his marriage, McNulty gives up on identifying his Jane Doe. In their investigation of Sobotka, the detectives discover a pattern in the computer and explain the connection to Daniels, but he still won't take the murders. Sobotka tries to play the political game on behalf of his union. Nick gets the chemicals that Vondas asked for and, as payment, accepts money and drugs--packaged for sale. D'Angelo wants to live life outside of Barksdale's umbrella, forcing Bell to bring in outside help for the problem.