The exclusionary rule is ameans of effectuating the Fourth Amendment. Without it, there's no such thing as unlawful search and seizure.
As Annie (and my ol' crim pro prof) note, you could fire the cops. But the cops ain't havin' that -- they'd prefer the exclusionary rule, I bet. I dig the Fourth, myself.
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
But as any lawyer knows, "unreasonable" has some flex room. I'd just give cops some healthy breathing room for what's reasonable. It would not normally include kicking in doors without a warrant or torture. A lot of "right wingnuts" object to this more than any liberal, believe me.