Rule 704 Texas Rules of Evidence Rule 704. Opinion on an Ultimate Issue An opinion is not objectionable just because it embraces an ultimate issue. ← Previous Rule 703: Bases of an Expert’s Opinion Testimony Next → Rule 705: Disclosing the Underlying Facts or Data and Examining an Expert About Them Previous RuleRule 703: Bases of an Expert's Opinion TestimonyNext RuleRule 705: Disclosing the Underlying Facts or Data and Examining an Expert About Them