Original Sin (S01E02)

Harlee faces the difficult choice of becoming an informant for the FBI, while Wozniak grows increasingly suspicious of his team. Fearing that Wozniak's investigation might expose her, Harlee proposes polygraph tests for everyone, an idea that ultimately goes awry. As Wozniak reviews footage from his initial meeting with Harlee for an appeals case, he uncovers a troubling secret from their history. At the same time, Espada supports Tess as she navigates the fallout from her husband's betrayal.