The United States has several standards for insanity, including the M'Naghten Rule (knowledge of right and wrong), the Irresistible Impulse Test (ability to control actions), the Durham Rule (crime as a product of mental illness), and the Model Penal Code standard (lack of substantial capacity to appreciate criminality or conform conduct to the law). These standards vary by jurisdiction.

Different states in the U.S. use various standards for insanity defense, the most notable being the M'Naghten Rule (focusing on the defendant's ability to understand the nature of the act or distinguish right from wrong), the Irresistible Impulse Test (ability to control actions), the Durham Rule (crime as a product of mental illness), and the Model Penal Code (a combination of understanding the criminality and conforming conduct to the law).

In the United States, several insanity standards are used, including the M'Naghten Rule (focusing on the defendant's ability to understand the nature of the act or distinguish right from wrong), the Irresistible Impulse Test (inability to control actions), and the Model Penal Code (a combination of the inability to understand criminality and conform behavior to the law). The Durham Rule, which focused on the crime being a product of mental illness, is less commonly used.

Different states in the U.S. have varying standards for insanity defense. The most common are the M'Naghten Rule (focusing on the defendant's ability to understand right from wrong), the Irresistible Impulse Test (inability to control actions), and the Model Penal Code Standard (a combination of the inability to understand wrongfulness and lack of control).

There are several insanity defense standards in the United States, including the M'Naghten Rule (based on the ability to understand right from wrong), the Irresistible Impulse Test (inability to control actions), the Durham Rule or New Hampshire Rule (crime is a product of mental illness), and the Model Penal Code (lacks substantial capacity to appreciate the criminality of conduct or conform to the law). The application of these standards varies by state.