In law, a witness is someone who, either voluntarily or under compulsion, provides testimonial evidence, either oral or written, of what they know or claim to know.
Forensic psychology is the application of scientific knowledge and methods to assist in answering legal questions that may arise in criminal, civil, contractual, or other judicial proceedings. Forensic psychology includes research on various psychology-law topics, such as: jury selection, reducing systemic racism in criminal law, eyewitness testimony, evaluating competency to stand trial, or assessing military veterans for service-connected disability compensation. The American Psychological Association's Specialty Guidelines for Forensic Psychologists reference several psychology sub-disciplines, such as: social, clinical, experimental, counseling, and neuropsychology.
Criminal psychology, also referred to as criminological psychology, is the study of the views, thoughts, intentions, actions and reactions of criminals and suspects. It is a subfield of criminology and applied psychology.
Weapon focus is the concentration on a weapon by a witness of a crime and the subsequent inability to accurately remember other details of the crime. Weapon focus is a factor that heavily affects the reliability of eyewitness testimony. This effect involves a witness to a crime diverting his or her attention to the weapon the perpetrator is holding, thus causing memory impairments and leaving less attention for other details in the scene, such as the attacker’s face, clothing or vehicle.
Forensic psychiatry is a subspeciality of psychiatry and is related to criminology. It encompasses the interface between law and psychiatry. According to the American Academy of Psychiatry and the Law, it is defined as "a subspecialty of psychiatry in which scientific and clinical expertise is applied in legal contexts involving civil, criminal, correctional, regulatory, or legislative matters, and in specialized clinical consultations in areas such as risk assessment or employment." A forensic psychiatrist provides services – such as determination of competency to stand trial – to a court of law to facilitate the adjudicative process and provide treatment, such as medications and psychotherapy, to criminals.
A miscarriage of justice occurs when an unfair outcome occurs in a criminal or civil proceeding, such as the conviction and punishment of a person for a crime they did not commit. Miscarriages are also known as wrongful convictions. Innocent people have sometimes ended up in prison for years before their conviction has eventually been overturned. They may be exonerated if new evidence comes to light or it is determined that the police or prosecutor committed some kind of misconduct at the original trial. In some jurisdictions this leads to the payment of compensation.
The CSI effect describes the various ways in which the exaggerated portrayal of forensic science on crime television shows such as CSI: Crime Scene Investigation influences public perception. The term was first reported in a 2004 USA Today article describing the effect being made on trial jurors by television programs featuring forensic science.
Offender profiling, also known as criminal profiling, is an investigative strategy used by law enforcement agencies to identify likely suspects and has been used by investigators to link cases that may have been committed by the same perpetrator. The originator of modern profiling was FBI agent Robert Ressler. He defined profiling as the process of identifying all psychological characteristics of an individual and forming a general description of their personality based on an analysis of crimes they have committed.
Forensic hypnosis is the use of hypnosis in the investigative process and as evidence in court which became increasingly popular from the 1950s to the early 1980s with its use being debated into the 1990s when its popular use mostly diminished. Forensic hypnosis's uses are hindered by concerns with its reliability and accuracy. The United States Department of Justice states that hypnosis may be occasionally used in investigation, but that the method faces "serious objections" and that information from hypnosis may be considered inadmissible. Forensic hypnosis has been considered for several uses including: hypnotic memory enhancement, evaluating a defendant's mental state, determining if a subject is telling the truth, preparing a witness for trial, determining if one is feigning trauma or a mental injury, and supporting the defense in a criminal case. Some of these uses have found more support than others as academic psychologists have reviewed these. While psychologists may find it appropriate to use memory enhancement to help in finding leads in the investigation process which should lead to uncovering more concrete evidence, its use in determining if a subject is telling the truth has been widely criticized.
Forensic psychotherapy is the application of psychological knowledge to the treatment of offender-patients who commit violent acts against themselves or others. This form of treatment allows for a therapist to potentially understand the offender and their mental state. It gives the individual providing treatment the opportunity to examine further whether the offender’s criminal behavior was a conscious act or not, what exactly their association with violent behavior is, and what possible motives could have driven them. The discipline of forensic psychotherapy is one that requires the involvement of individuals other than simply the therapist and patient. A therapist may collaborate with other professionals, such as physicians, social workers, nurses and other psychologists in order to best serve the offenders’ needs. Whether the treatment is successful or not relies on a multitude of things, but typically ensuring that a systemic approach is taken and that all involved in the treatment process are well informed and supportive has proven to be the most effective. In addition to group work forensic psychotherapy may also involve therapeutic communities, individual interaction with victims as well as offenders, and family work. In order for this specialized therapy to be as effective as possible, it demands the compliance of not only the patient and therapist, but of the rest of society as well. The main focus of forensic psychotherapy is not to condone the acts of the offender, but to obtain a psychodynamic understanding of the offender in order to attempt to provide them with an effective form of treatment to help them take responsibility for any crimes committed and to prevent the perpetration of crimes by the offender in the future. Guidelines have been set to ensure proficiency in the field of Forensic Psychology.
In eyewitness identification, in criminal law, evidence is received from a witness "who has actually seen an event and can so testify in court".
Saul Kassin is an American academic, who serves as a Disintguished Professor of psychology at the City University of New York's John Jay College of Criminal Justice and Massachusetts Professor Emeritus of Psychology at Williams College in Williamstown, Massachusetts.
Eyewitness testimony is the account a bystander or victim gives in the courtroom, describing what that person observed that occurred during the specific incident under investigation. Ideally this recollection of events is detailed; however, this is not always the case. This recollection is used as evidence to show what happened from a witness' point of view. Memory recall has been considered a credible source in the past, but has recently come under attack as forensics can now support psychologists in their claim that memories and individual perceptions can be unreliable, manipulated, and biased. As a result of this, many countries, and states within the United States, are now attempting to make changes in how eyewitness testimony is presented in court. Eyewitness testimony is a specialized focus within cognitive psychology.
Gary L. Wells is an American psychologist and a scholar in eyewitness memory research. Wells is a professor at Iowa State University with a research interest in the integration of both cognitive psychology and social psychology and its interface with law. He has conducted research on lineup procedures, reliability and accuracy of eyewitness identification. Wells has received many awards and honorary degrees, and he has gained recognition for his work and contributions to psychology and criminal justice.
Ronald Roesch is a professor of psychology at Simon Fraser University in British Columbia, Canada.
Karen Franklin is an American forensic psychologist. For her doctoral dissertation, she conducted research on anti-gay violence. She has also published commentaries about sex crimes, primarily expressing her opposition to the use of the hebephilia and other diagnoses in sexually violent predator regulations. She received the 2012 Distinguished Scientific Achievement Award in Psychology and the Monette-Horwitz Trust Award in 2001.
Judith L. Daylen(previously Cutshall) is a board-certified psychologist. In 1982, she received her B.A. in psychology and philosophy from the University of North Carolina. In 1985, Dr. Daylen received her M.A. in cognitive psychology, and in 1994 she received her PH.D. in clinical psychology both from the University of British Columbia. Dr. Daylen currently works as a clinical and consulting psychologist- she assesses the harm suffered to sexual assault victims and provides expert testimony in court. Recently, Dr. Daylen has focused on providing psychological assessments of victims of physical and sexual assault; however, she has past experience in providing both individual and group treatment to assault victims. To better understand the experience of assault victims and to assist them during times of crisis, Dr. Daylen also volunteered at a rape crisis center. She has even contributed to a book: "Trauma, Trials, and Transformation, Guiding sexual assault victims through the legal system and beyond". In addition to her work with sexual assault victims, Dr. Daylen has contributed to assessing the reliability of eyewitness testimony. Along with John C. Yuille in 1986, Dr. Daylen published a psychological experiment which concluded that eyewitness testimony is often reliable and has merit. Dr. Daylen is also an ordained lay practitioner of Zen Buddhism.
Bette L. Bottoms is a legal psychologist known for her work on child abuse, children's eyewitness testimony, and jurors' perceptions of child offenders and victims. She is a Professor Emerita of Psychology in the College of Liberal Arts and Sciences at the University of Illinois, Chicago.
Laura Smalarz is a psychologist researching psychology as it is related to the law. Smalarz focuses her work on forensic evidence, eyewitness identification, and the wrongfully convicted. She is an Associate Professor of psychology and director of the psychology and law lab at Arizona State University.
Suzanne Joy Yerex Blackwell is a New Zealand clinical psychologist, and holds an honorary position at the University of Auckland. In 2024 Blackwell was appointed a Member of the New Zealand Order of Merit for services to clinical and forensic psychology and the law.
