“Law is about the regulation of human behavior; psychology is the study of human behavior.” Understanding how humans think and behave should help you in all facets of law. Consequently, if you're aiming to write laws that will prevent bad behaviors, psychology helps you predict which rules will be effective.
For example, as their understanding of juries grows, psychologists will continue to investigate more complex issues in jury decision making such as the structure of complex trials, other sources of extralegal influence on jurors' comprehension, and the ways that proposed legal reforms can affect jury behavior.
Psychologists also work in the legal system as advocates. For example, in 1954 psychologists joined other social scientists to advocate for desegregation in the landmark case, Brown v. Board of Education. More controversially, psychologists can act as trial consultants and work for one side in a court case.
The field of psychology and law involves the application of psychological principles to legal concerns, and the interaction of psychology and law for individuals involved in the legal process.
Several leading universities now offer dual degree programs in psychology and law. In these programs, you can receive your juris doctorate while receiving a master's or doctoral degree in psychology.
[2] Also, psychologists are called by the Courts to give their testimony as legal experts under the Indian Evidence Act, 1872, for instance, the task of a forensic psychologist is to examine the memory of a witness whereas, on the other hand, a forensic psychologist helps to determine the proficiency of a defendant.