Petitioner's omission of the manner in which he discovered that he was on a blacklist was not a minor or extraneous detail, and the nationalization of the persecution implied by the blacklist was central to the claim; the late disclosure cannot be excused by saying that the petitioner and witnesses considered it a minor detail.
Agency was under no obligation to continue the proceedings to discover corroborating evidence. Adverse credibility determination based on the belief that the detail was a fabrication is well supported by the record.
Insufficient evidence of country-wide persecution of people of petitioner's faith.