What is the exclusionary rule in the context of police misconduct?

(1976) 428 U.S. 465, 539-540 [49 L.Ed.2d 1067, 1114] (dis. opn. of White, J.).) "To trigger the exclusionary rule, police conduct must be sufficiently deliberate that exclusion can meaningfully deter it, and sufficiently culpable that such deterrence is worth the price paid by the justice system. As laid out in our cases, the exclusionary rule serves to deter deliberate, reckless, or grossly negligent conduct, or in some circumstances recurring or systemic negligence." (Herring v. United States (2009) 555 U.S. 135, 144 [172 L.Ed.2d 496, 507].)