California, United States of America
The following excerpt is from Conservancy v. City of Santa Ana, G053003 (Cal. App. 2017):
A party challenging the fairness of an administrative hearing on the ground of bias has the burden of establishing "'"an unacceptable probability of actual bias on the part of those who have actual decisionmaking power over their claims."'" (Nasha v. City of Los Angeles (2004) 125 Cal.App.4th 470, 483.) The party seeking to show actual bias must prove bias "'with concrete facts.'" (Ibid.)
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