“25. … Although the charges in a departmental proceeding are not required to be proved like a criminal trial i.e beyond all reasonable doubt, we cannot lose sight of the fact that the enquiry officer performs a quasi-judicial function, who upon analysing the documents must arrive at a conclusion that there had been a preponderance of probability to prove the charges on the basis of materials on record. While doing so, he cannot take into consideration any irrelevant fact. He cannot refuse to consider the relevant facts. He cannot shift the burden of proof. He cannot reject the relevant testimony of the witnesses only on the basis of surmises and conjectures. He cannot enquire into the allegations with which the delinquent officer had not been charged with.”
M.V Bijlani v. Union of India2006 5 SCC 88 (SCC p. 95, para 25)