The following excerpt is from Justice v. Hoke, 90 F.3d 43 (2nd Cir. 1996):
Of course, evidence of a witness' bias must be competent to be admissible, and the trial court has broad discretion to curtail exploration of collateral matters. See People v. Hudy, 73 N.Y.2d 40, 56, 538 N.Y.S.2d 197, 535 N.E.2d 250 (1988). Nevertheless, "extrinsic proof tending to establish a reason to fabricate is never collateral and may not be excluded on that ground." Id.
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