Last month marked the 51st anniversary of Miranda v. Arizona. It is now 14 years shy of Medicare eligibility. What is remarkable is that the warnings themselves have never changed. Yet, like Dorian Gray, the picture hidden in the attic reveals the true ravages of age.Miranda actually is in need of some serious cosmetic surgery. Fortunately, professor Tonja Jacobi of Northwestern Pritzker School of Law has provided it in her …