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

established the Miranda warnings to safeguard the constitutional guarantee against self-incrimination. (J.D.B. v. North Carolina, supra, 564 U.S. at p. ___ [131 S.Ct. at p. 2401], quoting Dickerson v. U.S. (2000) 530 U.S. 428, 435 [120 S.Ct. 2326, 147 L.Ed.2d 405].) With the waiver of those rights, a confession procured by the employment of coercive or fraudulent tactics is only excluded if those tactics were calculated to produce false statements. (People v. Guerra (2006) 37 Cal.4th 1067, 1097.)