§5K2.13. Diminished Capacity (Policy Statement)
A sentence below the applicable guideline range may be warranted if the defendant committed the offense while suffering from a significantly reduced mental capacity. However, the court may not depart below the applicable guideline range if (1) the significantly reduced mental capacity was caused by the voluntary use of drugs or other intoxicants; (2) the facts and circumstances of the defendants offense indicate a need to protect the public because the offense involved actual violence or a serious threat of violence; or (3) the defendants criminal history indicates a need to incarcerate the defendant to protect the public. If a departure is warranted, the extent of the departure should reflect the extent to which the reduced mental capacity contributed to the commission of the offense.
1.For purposes of this policy statement
"Significantly reduced mental capacity" means the defendant, although convicted, has a significantly impaired ability to (A) understand the wrongfulness of the behavior comprising the offense or to exercise the power of reason; or (B) control behavior that the defendant knows is wrongful.