Improbably, deception often leads to truth. Still, might there be adverse consequences for having somehow engaged in the deception?

We see deception always on TV cop shows. Detectives falsely cajole suspects into confessing, telling them that "the train is leaving the station—your boy down the hall is itching to sell you out," whereas the police haven't even found him. A legally acceptable tactic for law enforcement agents.

No sensible prosecutor, though, wants to be near that: "You, detective, just bring me the results." After all, lawyers, including prosecutors are duty bound ethically to be truthful to those with whom they communicate. Responsible prosecutors won't falsely tell that to suspects or be present when that occurs, even though they may benefit from such deceptive conduct.