How is corroborative evidence considered in a sexual assault case?

In assessing the sufficiency of the corroborative evidence, two elements are considered: "1) that the evidence, if true, substantiates the testimony of a single witness who has sworn to the falsity of the alleged perjurious statement; 2) that the corroborative evidence is trustworthy." Weiler v. United States, 323 U.S. 606, 610, 65 S.Ct. 548, 550, 89 L.Ed. 495 (1945). While the independent evidence must be inconsistent with the innocence of the accused, it need only "tend to substantiate that part of the testimony of the principal prosecution witness which is material in showing" the accused's statement is false. Weiner, 479 F.2d at 927-28.