Impeachment is the process of attacking a witness’s credibility. In plain language, it means showing why the judge or jury should be cautious about believing the witness fully.
Why It Matters
The term matters because many cases depend less on hard physical proof than on whose account is trusted. Impeachment can reduce the persuasive force of testimony by exposing bias, inconsistency, poor perception, weak memory, or prior conflicting statements.
Where It Appears
The term appears in cross-examination, motion practice about prior statements, witness-preparation strategy, trial objections, and appellate review of evidentiary rulings.
Practical Example
A witness testifies that they clearly saw an event from across the street, but an earlier sworn statement said they arrived after it was over. Counsel may use that inconsistency to impeach the witness.
How It Differs From Nearby Terms
- Cross-examination is a questioning stage; impeachment is a credibility attack that may occur during it.
- Witness refers to the person giving testimony.
- Objection is used to challenge improper impeachment methods or improper testimony.
Related Terms
Knowledge Check
- Is impeachment about removing a public official from office here? No. In evidence law, impeachment means challenging a witness’s credibility.
- Does impeachment always prove the witness lied intentionally? No. It may simply show inconsistency, limited perception, or another reason to doubt reliability.