Forensic psychiatry uses the legal aspect of psychiatry to aid in court cases. Expert psychiatric testimony influences legal verdicts and judgments. A forensic psychiatrist evaluates individuals involved in court cases, plays an important part in custody suits, and provides treatment to incarcerated patients. He or she can determine competency in criminal cases, in legal business procedures (such as contracts or investments), and give assistance in harassment and discrimination cases.

Doctor density varies by specialty and location. Washington, D.C. has 31 practicing forensic psychiatrist in Washington.

According to 2005 Census estimates, Washington, D.C. has a population of 550,521. Of this population, 110,240 are under the age of 18 and 66,591 are at or above the age of 65.