What is the current state of the law on the Miranda privilege against self-incrimination?

In Miranda v. Arizona, the United States Supreme Court held that "when an individual is taken into custody or otherwise deprived of his [or her] 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 [or her] right of silence and to assure that the exercise of the right will be scrupulously honored, the following measures are required. He [or she] must be warned prior to any questioning that he [or she] has the right to remain silent, that anything he [or she] says can be used against him [or her] in a court of law, that he [or she] has the right to the presence of an attorney, and that if he [or she] cannot afford an attorney one will be appointed for him [or her] prior to any questioning if he [or she] so desires. Opportunity to exercise these rights must be afforded to him [or her] throughout the interrogation. After such warnings have been given, and such opportunity afforded him [or her], the individual may knowingly and intelligently waive these rights and agree to answer

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