Conn. Agencies Regs. § 31-301-8
Ordinarily, appeals are heard by the compensation review division upon the certified copy of the record filed by the commissioner. In such cases the division will not retry the facts or hear evidence. It considers no evidence other than that certified to it by the commissioner, and then for the limited purpose of determining whether the finding should be corrected, or whether there was any evidence to support in law the conclusion reached. It cannot review the conclusions of the commissioner when these depend upon the weight of the evidence and the credibility of witnesses. Its power in the corrections of the finding of the commissioner is analogous to, and its method of correcting the finding similar to the power and method of the Supreme Court in correcting the findings of the trial court.
Conn. Agencies Regs. § 31-301-8