13] The Trying Officer, upon consideration of the material on record came to the conclusion that the bus driver was guilty of gross negligence. The Trying officer has made note of the fact that despite efforts, Mr. Kalpesh Patel, the son of deceased Maruti car driver, who was said to be the following Maruti car could not be examined. No provision was brought to my notice, under which the Enquiry Officer or Trying Officer in the course of domestic enquiry can compel a witness to attend a domestic enquiry. In such circumstances, the finding of the Industrial Court that non-examination of Mr. Kalpesh Patel as a witness constitutes denial of opportunity to the bus driver to put forth his defence by way of cross-examination of the said witness, is clearly misplaced and unsustainable. In the case of Cholan Roadways Ltd. vs. Thirugnanasambndam3 the Supreme Court whilst invoking the principle of ' res ipsa loquitur' has held that there is no mandate to examine the passengers of a bus, which was involved in the accident in the course of domestic enquiry. In the said decision, the Supreme Court has also held that the correct standard of proof in relation to proof of domestic enquiry is ' preponderance of probability' and where, in a domestic enquiry, a standard of proof necessary in criminal trial came to be applied, a