What is the current state of the law on the Miranda rights?

"The rule of Miranda is well established: '[W]hen an individual is taken into custody or otherwise deprived of his freedom by the authorities in any significant way and is subjected to questioning, the privilege against self-incrimination is jeopardized. Procedural safeguards must be employed to protect the privilege, and unless other fully effective means are adopted to notify the person of his right of silence and to assure that the exercise of the right will be scrupulously honored, the following measures are required. He must be warned prior to any questioning that he has the right to remain silent, that anything he says can be used against him in a court of law, that he has the right to the presence of an attorney, and that if he cannot afford an attorney one will be appointed for him prior to any questioning if he so desires. Opportunity to exercise these rights must be afforded to him throughout the interrogation. After such warnings have been given, and such opportunity afforded him, the individual may knowingly and intelligently waive these rights and agree to answer questions or make a statement. But unless and until such warnings and waiver are demonstrated by the prosecution at trial, no evidence obtained as a result of interrogation can be used against him.' [Citation.]" (People v. Jennings (1988) 46 Cal.3d 963, 976.) "In reviewing a trial court's Miranda ruling, we accept the court's resolution of disputed facts and inferences and its evaluations of credibility, if supported by substantial evidence, and we independently determine, from the undisputed facts and facts properly found by the trial court, whether the challenged statement was illegally obtained. [Citation.]" (People v. Bacon (2010) 50 Cal.4th 1082, 1105.)