Case File 276 · Investigation Psychology

Does Interrogation Length Affect False Confession Risk?

By Murder Book Editorial TeamPublished by Gungrounds, the studio making Murder BookPublished 3 October 2026Updated 3 October 2026

Yes, interrogation length is one of the most well-documented risk factors for false confessions. A landmark study by Drizin and Leo examined 125 proven false confession cases and found that 84% occurred after interrogations lasting six hours or longer, with the average duration exceeding 16 hours. By comparison, typical police interrogations last between 30 minutes and two hours. The longer a suspect is questioned, the more fatigue, stress and desperation build, and research suggests these conditions make it harder for anyone, guilty or innocent, to maintain consistent resistance to confession pressure.

Key takeaways

In a study of 125 proven false confessions, 84% followed interrogations of six hours or more, with an average duration exceeding 16 hours.
Normal police interrogations typically last 30 minutes to two hours, making false confession cases dramatically longer.
Sleep deprivation during extended questioning has been shown to increase false confession rates by a factor of 4.5 in laboratory studies.
Young suspects and those with cognitive vulnerabilities are especially affected by long interrogation sessions.
No specific hour threshold guarantees a confession is false, but duration is a significant risk factor that researchers and legal scholars have identified.

Why does interrogation length matter?

Extended questioning creates a combination of physical and psychological pressures that compound over time. Fatigue impairs decision-making, emotional regulation and the ability to think through long-term consequences. A suspect who begins an interrogation fully able to weigh the costs of a false confession may, after many hours, focus only on ending the immediate discomfort of the session.

Drizin and Leo published their 2004 study in the North Carolina Law Review. It is one of the most cited analyses of this relationship. They examined 125 proven interrogation-induced false confession cases in the United States, documenting the circumstances under which innocent people confessed. The findings were striking: the average interrogation in these cases lasted more than 16 hours, and 84% of the false confessions came after six or more hours of questioning. This contrasts sharply with the typical interrogation length of 30 minutes to two and a half hours.

The researchers recommended that interrogations exceeding 12 hours should be categorically inadmissible in court. They also suggested that those lasting more than six hours should be admissible only if the prosecution could establish beyond a reasonable doubt that the confession was voluntary.

How does fatigue affect decision-making during questioning?

When someone has been awake for an extended period, their cognitive resources decline. Research on sleep deprivation and confession behaviour supports this directly. A study by Frenda, Berkowitz, Loftus and Fenn found that sleep-deprived participants were 4.5 times more likely to sign a false confession in a laboratory setting than rested participants. The study was published in the Proceedings of the National Academy of Sciences in 2016.

This does not mean every tired suspect will confess falsely. But it does mean that the protective factors people normally rely on, such as careful reasoning about consequences and the ability to resist social pressure, are weakened. For more on how sleep deprivation affects memory and questioning, the casebook covers this in a separate article.

Are certain people more vulnerable during long interrogations?

Yes. Research consistently identifies two groups as particularly at risk during extended questioning: young suspects and people with intellectual disabilities or cognitive impairments.

Drizin and Leo found that suspects under 18 made up 32% of known false confessors in their sample. Adolescents are developmentally less able to think through long-term consequences and more susceptible to authority pressure, both of which become worse with fatigue.

People with intellectual disabilities face similar compounding effects. They may be more eager to comply with authority figures and less able to understand their legal rights, especially as questioning stretches on and cognitive demands increase.

What other factors compound during long sessions?

Duration does not operate in isolation. Several interrogation tactics become more effective, and more dangerous, the longer a session continues. Minimization, in which an investigator downplays the seriousness of the offence or suggests leniency, can wear down resistance over hours. Maximization, which emphasises the strength of evidence and the severity of consequences, can create a sense of hopelessness that builds with time.

Kassin, Drizin, Grisso, Gudjonsson, Leo and Redlich published a 2010 white paper in Law and Human Behavior identifying the key risk factors for police-induced confessions. They noted that prolonged interrogation interacts with dispositional vulnerabilities such as youth, intellectual disability and mental illness. The paper called for mandatory time limits, mandatory recording and special protections for vulnerable suspects.

Drizin and Leo also found that more than 80% of the false confessions in their sample occurred in homicide cases. Homicide investigations often involve the highest stakes and the most sustained pressure, which may partly explain why the interrogations in those cases ran so long.

Does a long interrogation prove a confession is false?

No. A long interrogation is a risk factor, not proof. Many lengthy interrogations produce truthful confessions, and some false confessions occur after relatively short sessions. What the research shows is a pattern: when false confessions do occur, they tend to follow significantly longer interrogations than average.

This distinction matters because it prevents simplistic rules. An investigator cannot assume a confession is reliable simply because the interrogation was short, nor can a reviewer dismiss a confession solely because the session was long. Duration is one factor among several, including the tactics used during questioning, the vulnerabilities of the suspect and whether the confession contains details that can be independently verified.

Several researchers have proposed reforms based on the relationship between interrogation length and false confessions. Drizin and Leo offered some of the most specific recommendations for time limits, but the broader research community has also emphasised the importance of recording entire interrogations rather than only the final confession.

Recording allows reviewers to assess the full context: how long the session lasted, what promises or threats were made, how many times the suspect denied involvement before confessing, and whether the suspect appeared alert or exhausted. Without a recording, the length and conditions of an interrogation can be disputed, and the risk factors that research has identified may go unexamined.

How does Murder Book handle interrogation pressure?

Murder Book: The Art of Interrogation is an upcoming narrative interrogation game from Gungrounds, an independent studio in Zagreb, Croatia. The game places players on the other side of the table, examining suspects for inconsistencies and behavioural changes. Development screenshots show a technique menu that includes options such as Confrontation and Build Trust, suggesting that the game asks players to consider how their approach affects the information they receive.

The research above is relevant because it shows that pressure is not a neutral tool. In Murder Book, cases are designed for focused 5–10-minute sessions, but the underlying question, whether words reflect what actually happened or the pressure of the moment, is one the game asks players to weigh. Murder Book is in development for PC (Steam) and mobile, with release currently planned for the end of Q2 2027.