§ 803 Expert Opinion Evidence Rules

• •If someone's opinion in court is based on wrong or irrelevant info, the judge can stop them from sharing it.
• •If the person can still give their opinion without using the wrong info, they can share it.
• •The judge must stop the opinion if someone objects and the info is really bad.

A doctor says in court that a person was drunk because they smelled like beer, but the smell was actually from spilled beer on their shirt.

The judge can stop the doctor from saying the person was drunk based on the smell because it’s not fair. But if the doctor has other good reasons (like a blood test), they can still say the person was drunk.