This summary is not the rule. The rule text controls.
Here's a plain-English summary:
If a witness had trouble seeing, hearing, remembering, or thinking clearly, either when something happened or while they're testifying in court, the other side can bring this up. This means a lawyer can point out that a witness was drunk, on drugs, half-asleep, or had a medical condition that affected their ability to notice or recall details accurately.
The point of this rule is to help the judge or jury decide how much to trust what the witness is saying. If someone's eyesight was bad on the night they claim to have seen a car accident, or if a witness has memory problems that affect their ability to recall past events, that information matters. It helps people weigh whether the witness's account is reliable.
This rule doesn't automatically throw out a witness's testimony. It just allows the other side to raise doubts about how accurate or trustworthy that testimony might be, given the witness's physical or mental state at the relevant time.
