Whether the Due Process Clause requires suppression of a confession made by a mentally ill defendant when the police did not engage in coercive or wrongful conduct.
Holding
No. Coercive police activity is a necessary predicate to finding a confession involuntary under the Fourteenth Amendment's Due Process Clause.
Reasoning
The Court located the constitutional doctrine of involuntary confessions in protection against abusive government conduct. From Brown v. Mississippi onward, the Court's due-process confession cases involved substantial police overreaching—whether physical brutality, prolonged interrogation, threats, deprivation, or comparable tactics—that caused or contributed to the confession.
A suspect's mental condition remains relevant when it makes the suspect especially vulnerable to official coercion. But mental illness alone does not complete the constitutional inquiry. Blackburn v. Alabama and Townsend v. Sain did not hold otherwise because both involved police conduct that exploited or materially contributed to the defendants' impaired condition.
The Colorado courts found that the police did nothing coercive or improper, and Connelly did not challenge that finding. The later use of his statement at trial was not sufficient state action to convert a confession produced by internal hallucinations into a due-process violation; the required link is between coercive state activity and the confession itself.
A confession made under these circumstances may be unreliable, but reliability without police coercion is a question for state evidentiary law rather than federal due process. Suppression would not deter unconstitutional police practices, and the Constitution does not create a general right to confess only when one's motivations are fully rational or volitional.