Expert reports are sometimes biased, particularly rebuttal reports. I found this out in a survey of seven experts in the Maritimes reported in the first of the following two blogs added to the Bundle.

The second blog in the following short list reports on six ways of getting rid of bias in expert reports.

There is a total of seven good reads in the updated Bundle of Blogs posted November 29, 2019.

1. Is there an argument for a peer review of a peer review?  Posted January 11, 2020  I make the case for a peer review of a rebuttal report because most are biased.  I learned this after surveying the opinion of seven experts in the Maritimes. 
2. Ridding peer review of potential bias.  Posted December 30, 2019  A good read on six different ways of getting rid of bias in a peer review, in decreasing order of preference. 

(Posted by Eric E. Jorden, M.Sc., P.Eng. Consulting Professional Engineer, Forensic Engineer, Geotechnology Ltd., Halifax, Nova Scotia, Canada. March 28, 2021 ejorden@eastlink.ca)