Sometimes the best thing you can do to stop an overpowered player is to keep them distracted with dead-end leads, particularly when there's some kind of approaching deadline. Even if they're prepared for it, you've still deprived the other players of one of their big guns.
Assuming you WANT to thwart your players, of course. Not that I condone that sort of behavior.
Author Notes:
Assuming you WANT to thwart your players, of course. Not that I condone that sort of behavior.