The following excerpt is from Hernandez v. Kernan, Case No.: 3:16-CV-2460-AJB-LL (S.D. Cal. 2019):
The issue of whether the state trial court erred by permitting a witness to testify without a competency hearing is a matter of state law that is not entitled to federal habeas relief. See Schlette v. California, 284 F.2d 827, 834-835 (9th Cir.1960) (competency of witness generally a matter of state law).
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