What is the test for determining whether there is competent evidence to support a finding that a witness has been found guilty of sexual assault?

We may, of course, look into the record to discover whether there is competent evidence to support the finding. And we may look into it to find whether the court erred in the conclusion of law deduced by it from the facts found, and we may review errors alleged to have been committed as to the admission and rejection of testimony when the action of the court in this respect has been duly excepted to, and the right to question the same has been preserved on the record. But farther than that we have no right to go. Young v. Amy, 171 U.S. 179, 18 Sup.Ct. 802, 43 L.Ed. 127 (1898).