'The "fruit of the poisonous tree" doctrine' - would that be the idea that the edible fruit must be thrown out because the tree is poisoned? If so, I agree with you. If the police break the law, they can suffer appropriate consequences - but that should not include the freeing of criminals. And no one has satisfactorily answered the question of what the response should be if an illegal stop and/or search reveals a murder victim, or a hostage.