What does Janie learn about Caleb during her visit to the captain's office in the novel, Wake?

When Cabel takes Jaime to the captain's office so the captain can tell Janie the truth about Cabel's relationship with Shay, Janie learns that Cabel is actually a confidential informant. He is just pretending to be with Shay to try to bust her father, who is a drug dealer.