Larry Darden had been charged with felony-murder, unarmed robbery, and four counts of first-degree criminal sexual conduct. At the trial, psychiatrists for both the defense and the prosecution testified about Darden's state of mind at the time of the alleged offense. In the appeal Darden claimed that the statutory definitions of mental illness and legal insanity were so vague and overlapping that the trier of fact was given unlimited discretion in deciding which verdict to return. Darden also challenged the treatment and evaluation provisions of the law. The appellate court's opinion illustrates its commitment to upholding legislative enactments. The law has many practical problems, but constitutional challenges of the type presented in the Darden case are unlikely to be successful. Footnotes.