Explain the rule of 'nemo judex in causa sua' under Administrative Law.

Rule against bias (nemo judex in causa sua): According to this rule no person should be made a judge in his own cause. Bias means an operative prejudice whether conscious or unconscious in relation to a party or issue. It is a presumption that a person cannot take an objective decision in a case in which he has an interest. The rule against bias has two main aspects- one, that the judge must not have any direct personal stake in the matter at hand and two, there must not be any real likelihood of bias. Bias can be the following types: Pecuniary Bias Personal Bias Subject matter Bias