What is the current state of the law on corroboration of witness testimony?

8 U.S.C. 1158(b)(1)(B)(ii). "An applicant's failure to corroborate his or her testimony may bear on credibility, because the absence of corroboration in general makes an applicant unable to rehabilitate testimony that has already been called into question." Biao Yang v. Gonzales, 496 F.3d 268, 273 (2d Cir. 2007). "We generally defer to the agency's evaluation of the weight to be afforded an applicant's documentary evidence." Y.C. v. Holder, 741 F.3d 324, 332 (2d Cir. 2013).

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