In GBMI cases, what standard must the defendant meet to prove mental illness?

• A. Preponderance of the evidence
• B. Beyond a reasonable doubt
• C. Clear and convincing evidence
• D. Reasonable suspicion

Answer: (A)

In a Guilty But Mentally Ill (GBMI) case, the issue is proving that the defendant was mentally ill at the time of the offense. The standard to meet for that proof is a preponderance of the evidence, meaning it’s more likely than not that the defendant was mentally ill. This lower standard fits GBMI because the verdict combines a finding of guilt with a recognition that mental illness affected culpability, rather than requiring the high certainty demanded in an insanity defense.

Preponderance of the evidence is greater than just a suspicion but not as strict as beyond a reasonable doubt. It’s not about whether the police had reasonable suspicion, which is a different concept entirely used for investigative thresholds. It’s also not the higher standard of clear and convincing evidence, which is used in some other contexts (like certain civil commitments or other insanity standards) but not for proving mental illness in a GBMI determination in Kentucky. So the mental-illness finding is proven by a simple tipping of the scales—more likely than not.