§ 702 Witness Personal Knowledge Requirement

• •A witness can only talk about what they saw or know themselves.
• •If someone objects, the witness must prove they know what they're talking about before they can testify.
• •The witness can prove they know something by sharing how they know it, as long as it's allowed by other rules.

A person sees their neighbor's dog bite someone.

The person can tell the court what happened because they saw it with their own eyes. But if the neighbor says the person wasn't there, the person must first explain how they saw the dog bite to prove they really know what happened.