The following excerpt is from Comer v. Stewart, 215 F.3d 910 (9th Cir. 2000):
Id.; see also Drope v. Missouri, 420 U.S. 162, 180 (1975) ("[E]vidence of a defendant's irrational behavior, his demeanor at trial, and any prior medical opinion on competence to stand trial are all relevant in determining whether further inquiry is required, but . . . even one of these factors standing alone may, in some circumstances, be sufficient."); Pate v. Robinson, 383 U.S. 375, 385-86 (1966) (holding that further inquiry is required where a defendant displays irrational behavior).
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