Bias on the part of an expert is the chief reason for doubting that expert.
This refers to the use of prejudice in deciding an outcome where one view is given either a favorable or unfavorable outlook without a solid basis for that.
Hence. we can see that when bias is used in making decisions, then this would mean that the expert is compromised and this would make a person to begin to doubt the expert.
Read more about bias here:
https://brainly.com/question/4540984