Commonwealth v. Kindell, 993 N.E.2d 1222

Defendant Gina Kindell was tried on assault and battery by means of a dangerous weapon; jury convicted her of the lesser included offense of assault and battery.
Commonwealth relied on a single witness, James Hubbard (stepfather of defendant’s husband, Steven Kindell); defendant did not testify.
Hubbard testified he was attacked on April 21, 2011, and suffered two small puncture wounds; he identified an ice pick in the defendant’s hand.
Defense proffered that Steven Kindell was incarcerated at the time because the defendant had testified against him in a prior domestic violence proceeding and that Hubbard had threatened the defendant to deter her testimony.
Trial judge barred defense cross-examination of Hubbard about (a) his stepson’s incarceration, (b) the restraining orders, and (c) Hubbard’s threats/motive to fabricate, ruling the evidence irrelevant or unduly prejudicial.
On appeal the court held the exclusion improperly foreclosed inquiry into witness bias and required a new trial as the defense hinged on impeaching Hubbard’s credibility.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether trial court improperly limited cross-examination on witness bias	Judge acted within discretion to exclude evidence as confusing, prejudicial, or irrelevant	Exclusion prevented impeachment of sole Commonwealth witness and denied meaningful defense; evidence bore on motive to fabricate	Reversed: defendant had constitutional right to probe bias; exclusion was erroneous
Whether probative value was substantially outweighed by unfair prejudice (§403 balancing)	Proffered facts would mislead jury and waste time; prejudice outweighed marginal probative value	Evidence was directly probative of witness credibility and not unfairly prejudicial	Court held probative value of bias evidence was significant and not unfairly prejudicial in these circumstances
Harmless-error analysis for denial of cross-examination	Any error harmless given medical records and jury verdict on lesser charge	Error was not harmless because case depended entirely on witness credibility and excluded inquiry might have altered verdict	Reversal required; cannot say error did not contribute to verdict
Admissibility of restraining orders and related extrinsic evidence	Such matters were collateral or cumulative and could confuse jury	Restraining orders and related history were relevant to show bias/motive and permissible impeachment	Court did not need to decide all related rulings but stressed bias evidence is rarely collateral and should have been admitted for impeachment

Commonwealth v. Tam Bui, 419 Mass. 392 (1995) (judge cannot bar inquiry into possible witness bias once plausible showing is made)
Commonwealth v. Noeun Sok, 439 Mass. 428 (2003) (criminal defendant has constitutional right to cross-examine witness to show bias)
Davis v. Alaska, 415 U.S. 308 (1974) (right to expose witness motivation is a constitutionally protected function of cross-examination)
Olden v. Kentucky, 488 U.S. 227 (1988) (exclusion of cross-examination about witness bias implicates confrontation rights)
Delaware v. Van Arsdall, 475 U.S. 673 (1986) (harmless-error framework for constitutional limitation on cross-examination)
Commonwealth v. Aguiar, 400 Mass. 508 (1987) (defendant entitled to present the whole relationship to jury to show witness bias)
Commonwealth v. LaVelle, 414 Mass. 146 (1993) (evidence of bias is generally not a collateral matter and may be shown by extrinsic proof)