We know that clients have confidential communications with their lawyers, patients have confidential communications with doctors, informants have confidential communications with police or journalists. The question for this discussion post is WHY. Why do we allow such privileges? If the lawyer or doctor, for instance, has information of guilt that would help get a bad person off the street and punish them for their wrongdoing thus promoting justice, then why would we have a system where such probative evidence could be prevented from being admitted? In other words, what is the logic behind the policy of allowing privilege in judicial proceedings?