"It became a very personal script. I was interested in the whole phenomenon and process of being undercover. It's a very dramatic projection for an individual, to put yourself into that world and become in some ways who you really are, because that's what undercover work really is: turning up the volume on your impulses and throttling back on your inhibitions until it becomes your favorite identity. You don't become someone you're not: You become more of yourself -- applied, obviously, to very dangerous circumstances."