In a world where everything can happen, Indonesia is a country that lets its civilians have free will. Free will does not mean people can do anything they want but people are not entirely restricted to do trivial things. That is why countries have their own laws in place to keep the civilians in line in order to create harmony. However, there are instances where rules are indefinitely broken, whether it be breaking a mere traffic rule or a crime that are fit to be punished to death. Knowing how crimes are done, there are variety types of people especially people with mental issues that are diagnosed by psychiatrists or psychologists. In some occasions, mentally ill people could not help but do what they did. Mental illness such as Dissociative Identity Disorder is an illness where some people have the tendency to do things they did not remember doing, such as crimes. This could be ruled as something the defendant are not capable of taking the criminal responsibility. That is why, through research methods by interview, as well as analysing rule books and written sentences from the judge, this research paper is written to find out what are the criminal responsibilities given to people with DID based on the criminal rulebook of Indonesia and how does a psychiatrist who specializes on this sort of mental illness have a big impact in a judge’s decision during court. The final conclusions made are the fact that psychiatrists don’t have a big impact in a judges’ decision making as well as, in reality some people with mental illnesses are still deemed responsible for their crimes. This shows that the decision still needs more consideration due to certain circumstances.