Is a confession made by a police officer as a result of a promise of benefit or leniency an involuntary or inadmissible?

A confession "elicited by any promise of benefit or leniency," whether express or implied, is involuntary and therefore inadmissible. (People v. Holloway (2004) 33 Cal.4th 96, 115.) "However, mere advice or exhortation by the police that it would be better for the accused to tell the truth when unaccompanied by either a threat or a promise does not render a subsequent confession involuntary. . . . Thus, "[w]hen the benefit pointed out by the police to a suspect is merely that which flows naturally from a truthful and honest course of conduct," the subsequent statement will not be considered involuntarily made. [Citation.]" (Ibid.)