Whenever you play dance music, it serves a function. It becomes a utility; you have to worry about the tempos and what you're going to play for people. But when you're playing for listening, you're free.
Any time a writer thinks he has all the answers to how someone should talk or react or end a scene, it's a spontaneity-killer.
I'm unique for a suspense author in that I don't have a specialty background. A lot of suspense writers used to be lawyers or crime beat reporters. I didn't even know a cop when I started out. I finally figured out that I could visit prisons - I just had to be willing to make the phone calls.