Forensic Psychology: Bridging Psychology and the Legal System

When a crime shakes a community, investigators look for fingerprints, CCTV footage, and forensic evidence. But there is another kind of evidence that often goes unnoticed: the mind of the accused, the memory of the witness, and the behavioural patterns that shape the offence itself. This is where forensic psychology steps in, applying psychological science to the machinery of law. It is a relatively new discipline in India, yet its role in criminal investigations, courtroom testimony, and prisoner rehabilitation is expanding rapidly as the justice system grapples with increasingly complex crimes.

What is forensic psychology? 🔗

Forensic psychology is the meeting point of psychology, law, and forensic science. It applies psychological principles to legal matters, helping courts, police, and correctional institutions make better-informed decisions. While clinical psychology focuses on diagnosis and treatment, forensic psychology focuses on understanding the behaviour of offenders, victims, and witnesses within a legal framework.

The field is built on a simple premise: every crime is a human act, and human acts have psychological roots. A forensic psychologist might be asked to assess a defendant’s mental state, evaluate witness credibility, profile an unknown offender, or advise on sentencing and rehabilitation. The discipline gained formal recognition as a specialty only in recent decades, but its practical value to the courts is older than that.

How forensic psychology differs from forensic psychiatry 🔗

People often confuse the two. Forensic psychiatrists are medical doctors who can prescribe medication and diagnose mental disorders in a clinical sense. Forensic psychologists are trained in behavioural science and psychometric assessment, relying on structured interviews, psychological tests, and research on human cognition. Both are called upon by courts, but their tools and vocabularies differ. In Indian courtrooms, both operate as expert witnesses under Section 45 of the Indian Evidence Act, 1872, a provision that allows courts to consider opinions of persons skilled in a specialised field.

The historical journey of forensic psychology 🔗

Forensic psychology as a formal discipline traces its roots to the late 19th and early 20th centuries in Europe and the United States. One of the earliest figures was Hugo Münsterberg, a German-American psychologist whose 1908 book On the Witness Stand argued that psychology could illuminate everything from eyewitness memory to false confessions.

In India, the story began much later. The Central Bureau of Investigation’s lie detection unit, established in 1968, gave forensic psychology its first institutional foothold. Over the decades, psychological techniques gradually entered police work, though they remained on the margins of mainstream investigation. A turning point came in 2003, when Professor C.R. Mukundan of NIMHANS developed a technique called Brain Electrical Oscillation Signature (BEOS) profiling, a homegrown innovation that attempted to identify experiential memory in suspects. In 2016, NIMHANS in Bengaluru established a Centre for Human Rights, Ethics, Law and Mental Health, which offers training in investigative applications of forensic psychology.

Core roles of a forensic psychologist 🔗

The work of a forensic psychologist is remarkably diverse. It stretches from the crime scene to the courtroom to the prison cell, and it involves both clinical skill and scientific rigour.

Criminal profiling 🔗

When police face a serial crime or a complex case with no obvious suspect, forensic psychologists help construct a psychological profile of the likely offender. By analysing crime scene details, victim selection patterns, and the method used, a profiler tries to infer characteristics such as age range, likely occupation, prior criminal history, and psychological traits. This process is not a magic bullet, but it can narrow down the field of suspects and direct investigative resources.

Assessing mental state and competency 🔗

A defendant cannot be tried if they are unable to understand the proceedings or assist in their own defence. Forensic psychologists evaluate competency to stand trial and also assess criminal responsibility – that is, the mental state of the accused at the time of the offence. This is directly relevant to the insanity defence, which we will look at shortly.

Expert testimony in court 🔗

Forensic psychologists appear as expert witnesses to explain psychological concepts to judges. They may testify about the reliability of eyewitness memory, the effects of trauma on a victim’s recall, the mental condition of an accused, or whether someone meets the legal threshold for insanity. Their testimony does not decide the case, but it gives the court a scientific lens through which to examine the evidence.

Victim support and child forensic interviewing 🔗

Forensic psychologists also work with survivors of sexual violence, child abuse, and trafficking. In cases involving minors, a specially trained psychologist conducts child forensic interviews, using age-appropriate techniques to obtain accurate information without retraumatising the child. They also help prepare victim impact statements for sentencing hearings.

Correctional psychology and rehabilitation 🔗

Inside prisons, forensic psychologists assess inmates’ risk of reoffending, design rehabilitation programmes, and provide counselling for issues such as substance abuse, anger management, and mental illness. They may also sit on juvenile justice boards or advise family courts on child custody matters.

Forensic psychology and the Indian courtroom 🔗

Indian law has only gradually made space for psychological expertise, and its admissibility is governed by a specific statutory framework.

Section 45 of the Indian Evidence Act (now Bharatiya Sakshya Adhiniyam, 2023) 🔗

The foundational provision is Section 45 of the Indian Evidence Act, 1872, which permits courts to consider the opinions of experts on matters of science, art, or specialised knowledge. With the Bharatiya Sakshya Adhiniyam replacing the 1872 Act, expert testimony – including psychological analysis – continues to be admissible, keeping the door open for forensic psychological insights in criminal trials.

The insanity defence: Section 84 IPC / Section 22 BNS 🔗

One of the most important intersections of psychology and criminal law in India is the insanity defence. Section 22 of the Bharatiya Nyaya Sanhita, which replaces Section 84 of the old Indian Penal Code, provides that an act committed by a person with a mental condition rendering them incapable of understanding the nature and consequences of their actions, or of knowing that the act is wrong, shall not be considered an offence. The language subtly broadens the earlier formulation by adding awareness of consequences, aligning the law more closely with contemporary psychological understanding.

Courts distinguish between legal insanity and medical insanity. A person may have a diagnosed mental illness and still be held criminally responsible if, at the moment of the offence, they could distinguish right from wrong. This is why forensic evaluations focus on the accused’s state of mind at the time of the act, which is a challenging retrospective exercise.

The real-world impact of this defence is limited. A study reviewing High Court judgments between 2007 and 2017 found that insanity pleas succeeded in only about 17% of cases, and that documentary proof of mental illness prior to the crime strongly influenced the outcome. Without pre-existing medical records and a psychiatrist’s testimony, the defence rarely stands.

The Selvi judgment and the ethics of deception detection 🔗

Forensic psychology’s most controversial tools in India have been narco-analysis, polygraph testing, and brain mapping (BEOS). The watershed moment came in 2010 with the Supreme Court’s ruling in Selvi v. State of Karnataka. The Court held that the involuntary administration of these techniques violates Article 20(3), which protects against self-incrimination, and Article 21, which guarantees the right to life and personal liberty.

The practical effect is that these tests can only be conducted with the informed, documented consent of the subject, and even then, the results are treated as corroborative rather than direct evidence. The National Human Rights Commission issued guidelines for the administration of polygraph tests as early as 2000, stressing procedural safeguards. Together, these rulings and guidelines have placed forensic psychology squarely within the bounds of constitutional rights – a welcome check, even if it limits the evidentiary weight of psychological techniques.

Challenges facing forensic psychology in India 🔗

Despite its promise, forensic psychology in India is still finding its feet. The obstacles are structural, professional, and cultural.

Shortage of trained professionals 🔗

Unlike the United States, India does not yet have a formally recognised specialty board for forensic psychology. Most practitioners are clinical psychologists or psychiatrists who have picked up forensic skills through practice. Dedicated training programmes are few, concentrated in institutions such as NIMHANS, and the demand far outstrips supply.

Limited institutional infrastructure 🔗

Most forensic psychology units operate out of state Forensic Science Laboratories, often located in urban centres. Rural police stations, where many crimes originate, rarely have access to psychological consultation. Prisons, where rehabilitation should be a core function, typically lack the staff and programmes needed to make psychological intervention meaningful.

Ethical and legal grey zones 🔗

Forensic psychologists face recurring ethical dilemmas. They must remain objective while working closely with police or prosecution. They must balance confidentiality with their legal duty to disclose certain information. And they must be careful not to drift into dual roles – for instance, treating an individual they are also evaluating for a court.

Public and judicial awareness 🔗

Even when forensic psychologists are available, many police officers, lawyers, and judges are unfamiliar with what they actually do. Psychological evidence is still treated with some caution, partly because the science is nuanced and partly because the Indian legal tradition has historically leaned on physical forensics and eyewitness accounts.

The road ahead 🔗

The future of forensic psychology in India is shaped by several converging trends. Crimes are becoming more complex – cybercrime, financial fraud, organised trafficking, and terror-related offences all demand behavioural insight that traditional forensics cannot provide. Digital forensics and cyberpsychology are emerging as new specialisations, as investigators work to understand online grooming, radicalisation, and deepfake-enabled fraud.

More universities are adding forensic psychology to their curricula, and specialised postgraduate courses are slowly expanding. If the discipline is to reach its potential, India will need clear standard operating procedures for when and how forensic psychologists are involved, stronger institutional links between mental health services and the criminal justice system, and serious investment in prison-based rehabilitation. The current use of forensic psychology largely as corroborative evidence reflects both the novelty of the field and the caution of the courts, and that balance will take time to evolve.

Forensic psychology sits at the uncomfortable but important junction of mind and law. It reminds us that justice is not just about what happened, but about why it happened, and what the legal response should be. As the discipline matures in India, it has the potential to make the criminal justice system more humane, more accurate, and more just.

What do you think? Should Indian courts rely more heavily on forensic psychological evidence, even when its findings are probabilistic rather than definitive? And how can the justice system balance the investigative value of techniques like narco-analysis with the constitutional protection against self-incrimination?

References

1. https://www.legalbites.in/forensic-law/role-of-forensic-psychologists-in-the-criminal-justice-system-1075824
2. https://blog.ipleaders.in/role-forensic-psychology-understanding-criminal-psychology/
3. https://ijcrt.org/papers/IJCRT2411632.pdf
4. https://www.jetir.org/papers/JETIR2007182.pdf
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC11469568/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC6436411/
7. https://blog.ipleaders.in/right-remain-silent-case-commentary-smt-selvi-v-state-karnataka/
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC3171915/
9. https://www.indianmentalhealth.com/pdf/2018/vol5-issue2/Viewpoint_Article_Forensic_Psychology.pdf