[He picks up the card, curiousity winning out from suspicion, and his eyes nearly pop when he reads it. This guy was a CSI agent?]

Ah, um... t-thank you, sir! [Oh jeez, Xiaolang's totally kicking himself for being rude to him earlier. Maybe this was what his mother meant by being more sociable to people?] I'm not really looking to get into that field myself, but I... I wouldn't mind seeing how some of it works?