State v. Deets
In State v. Deets, 187 Wis. 2d 630, 523 N.W.2d 180, 182, 183 (WisApp 1994), the court determined the detective's statement was "a reasonable prediction," and "not a threat of penalty." 523 N.W.2d at 183 n.2.
The Court held:
Coercive conduct does not occur when, as here, an officer, without promising leniency, tells a defendant that if he or she does not cooperate the prosecutor will look upon the case differently. In either case, the officer does nothing other than predict what the prosecutor will do, without making a promise one way or the other. Id.