What is the standard of review used to determine the voluntariness of a confession?

In Jimenez the court adopted the beyond the reasonable doubt standard as controlling the trial court's decision as to the voluntariness of a confession. (People v. Jimenez, supra, 21 Cal.3d at p. 605, 147 Cal.Rptr. 172, 580 P.2d 672.) ⁶ The court reasoned that the use of the higher standard of review would decrease the risk that an involuntary confession would be admitted. (Id. at p. 606, 147 Cal.Rptr. 172, 580 P.2d 672.) Additionally, this would also decrease the risk that a false involuntary confession would be admitted and therefore

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