What is the current state of the law on Miranda?

"It is settled that Miranda advisements are required only when a person is subjected to 'custodial interrogation.' [Citations.]" (People v. Davidson (2013) 221 Cal.App.4th 966, 970.) "On appeal, we defer to the trial court's factual findings supported by substantial evidence and independently determine from the factual findings whether appellant was in custody for Miranda purposes. [Citation.]" (Ibid.)