: Techniques like the Reid Technique or the PEACE model (Planning, Engage, Account, Closure, Evaluation) are used to ensure that a suspect's statement is reliable and not the result of coercion.
In many jurisdictions, such as the UK under , suspects must be informed of their rights and safeguards before a voluntary interview can be considered valid evidence. Failure to respect these rights can result in evidence being ruled inadmissible in court. Investigative interviewing | College of Policing suspect - Mr Validity
: In some cases, the validity of a confession or a suspect's involvement is challenged based on their mental competence. For example, in the case of Pedro Hernandez (suspect in the Etan Patz case), the defense and prosecution sparred over the "validity of his confession" due to his mental state. : Techniques like the Reid Technique or the