What is the current state of the law on the Miranda privacy right against compulsory self-incrimination?

Ultimately, then, it is this right against compulsory self-incrimination, and not simply some felicitous tests uninformed by their policy purposes, which underlies Miranda and its progeny. It is that right which is at issue here and which should guide this court's decision. In considering the facts in this case, "no one could contend that the interrogation faced by bore any resemblance to the historical practices at which the right against compulsory self-incrimination was aimed." (Michigan v. Tucker, supra, 417 U.S., at p. 444, 94 S.Ct., at p. 2363.)