When can a police force compel a suspect to give an involuntary statement?

"The due process clause of the Fourteenth Amendment to the United States Constitution bars the admission of 'any involuntary statement obtained by a law enforcement officer from a criminal suspect by coercion.' [Citation.] So when the police obtain a suspect's statements 'by "techniques and methods offensive to due process . . .' . . . or under circumstances in which the suspect clearly had no opportunity to exercise "a free and unconstrained will, "' the statements are inadmissible." (People v. Mendez (2019) 7 Cal.5th 680, 698.)