How can a witness be impeached?

A witness can be impeached by demonstrating factors that undermine their credibility and reliability as a source of information. This includes prior criminal convictions, which may indicate a tendency toward dishonesty, and evidence of physical disability that might affect their ability to perceive or recall events accurately. Additionally, presenting inconsistent statements that the witness has made or demonstrating any potential bias they may have in relation to the case can create doubt about the trustworthiness of their testimony. This comprehensive approach effectively illustrates why the witness may not be a reliable source, affirming the importance of assessing various aspects of their background and statements when determining their credibility in legal proceedings.