Conclusions
Rules of evidence are meant to screen what evidence the jury may consider to prevent testimony that is mere opinion from infringing upon the territory of jury decision-making. Rule 704(b) reversed the trend toward permitting the testimony of experts on the ultimate issue. Since so much faith is placed in the jury system, limiting what a jury can consider narrows the jury's options. As in the past, lay witnesses may testify to facts only.
The result of rule 704(b) is to prevent expert witnesses such as psychologists and psychiatrists from testimony regarding how the defendant's mental state affected an element of the crime or an element of the defense. It has been ruled that 704(b) bans expert opinions on mental states affecting other elements, not only on questions of insanity, but also on questions on all mental states forming an element of a crime or defense such as premeditation in a murder case or specific intent and mens rea.
Read more about this topic: Ultimate Issue (law)
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