The following excerpt is from Mann v. Ryan, 828 F.3d 1143 (9th Cir. 2016):
Our review of the state habeas court's credibility determinations is highly deferential. Marshall v. Lonberger , 459 U.S. 422, 434, 103 S.Ct. 843, 74 L.Ed.2d 646 (1983) (28 U.S.C. 2254(d) gives federal habeas courts no license to redetermine credibility of witnesses whose demeanor has been observed by the state trial court....).
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