California, United States of America
The following excerpt is from Thompson v. State Personnel Bd., 201 Cal.App.3d 423, 247 Cal.Rptr. 210 (Cal. App. 1988):
" 'Credibility, or lack thereof, is for the factfinder, not the reviewing court, to determine. The trier of fact's determination will be interfered with on appeal only when it appears that the witness' testimony is inherently so improbable as to be unworthy of belief....' " ( Flowers v. State Personnel Bd., supra, 174 Cal.App.3d at p. 759, 220 Cal.Rptr. 139.)
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