What is the current state of the law on implied promises of leniency or benefits from the police?

The relevant principles regarding implied promises of leniency or benefits are stated in People v. Hill (1967) 66 Cal.2d 536, 549: "The line to be drawn between permissible police conduct and conduct deemed to induce or to tend to induce an involuntary statement does not depend upon the bare language of inducement but rather upon the nature of the benefit to be derived by a defendant if he speaks the truth, as represented by the police. Thus, 'advice or exhortation by a police officer to an accused

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