As I said to one of your little friends. He is obviously aware of what is going on and their progress otherwise he wouldn't have eluded them thus far.

The fact is, if they're doing as well as you say they are then it could turn the tables on him. Let him know that they know his game. Isn't that what you commoners' guards do when making public announcements or putting wanted posters around. Increase awareness or something?

The detectives are creating the exact same panic amongst people that this killer quite obviously wants by not trusting anyone. If you want to avoid it then shock and scare them all. Give them the bluntest truth possible.