Cal relies on technology such as virtual reality to help save the life of a veteran on the episode "React to Contact." Check out the official Fox promo for it now.
A former colleague of Gillian and Cal's is killed on the 6/14/10 episode of Lie to Me. That leads to scenes such as this, as the characters' pasts comes back into play.
Weil: You haven't done enough muck-raking for one day? Ria: Sir. We don't think you were doing anything sexual at that club, because, I believe this escort, Melissa, who you paid for time with- Weil: What about her? Ria: She's your daughter.
Gillian: Do you still have that note, that I brought you? I want it for my office. Cal: (handing over the note) You really are a pack rat. Gillian: You could have just told me what this was for. Cal: No. You're a terrible liar. Gillian: Normal people think that's a good thing.