Which factor indicates witness bias may affect testimony?

• A. Consistent statements from all witnesses
• B. High-quality corroborating evidence
• C. A lack of any inconsistencies
• D. The presence of potential incentives or bias from witnesses

Answer: (D)

Witness bias shows up when a witness has incentives or motive that could shape what they report. If someone stands to gain financially, avoid punishment, owe a debt, have a personal grievance, or be closely connected to a party, those factors create a reason to question how objective their account is. This hint prompts investigators to weigh the testimony more carefully, seek independent corroboration, and look for distortions in details or emphasis. By contrast, consistent statements across witnesses, strong corroborating evidence, or a lack of inconsistencies can support credibility but don’t by themselves prove freedom from bias. The main idea is to identify motives or incentives that could consciously or unconsciously influence what the witness says.