In an attempted first degree murder case, the trial court did not err when it refused a request to instruct on the partial defense of mental disease or defect, where appellant elicited no expert testimony that he suffered from such a disease or defect at the time of the offense. The expert testimony was simply that people who smoke rock cocaine have an impaired mental state; there was no specific testimony regarding appellant’s mental state at the time of the offense was offered to the jury. Further, the jury was properly instructed regarding voluntary intoxication.