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Farik (Oded Fehr) convinces the owner of a chemical plant to use Xpert Security (Farik's cover job) to do background checks on all of his employees. He uses that information to target an unhappy worker, Ernest Jefferson, who might be amenable to procuring some phosgene, which turns into a toxic gas at room temperature. Darwyn (Michael Ealy) befriends Jefferson, and eventually convinces him to sell him the phosgene, which he claims he needs for a home remodeling job. Darwyn also pays a visit to his mother. He also visits Marcus's (Jake Soldera) school, to be the boy's special guest for show and tell. But later he gets some surprising information about Gayle (Melissa Sagemiller) from Ray (James LeGros). It turns out that Gayle's husband is not dead, but in San Quentin on a drug charge. Again, Ray tries to convince Darwyn to end the relationship. Tommy (Blake Shields) gets an unwelcome surprise visit from his mother, Lynn (Ally Walker), who is in town for a symposium. He snubs her, sending her into the surprisingly sympathetic arms of Christian (Alex Nesic). Farik performs a little experiment at Dodger Stadium, and later, tests out his chemical weapon on the dogs that his crew procured. "The dogs we'll target next," he tells them, "have two legs instead of four."