Commonwealth v. Hinds, 487 Mass. 212

Background

In March 2016 Adrian Hinds (defendant, Black) fought with Miranda Arthur‑Smith and Nathaniel Cherniak (complainant, White); Hinds claimed self‑defense and that Cherniak attacked him from racial animus.
Cherniak and Arthur‑Smith testified Hinds initiated the hammer attacks; Hinds testified Cherniak had been slashing his tire with a knife and that he acted to defend himself and his property.
Hinds sought to call two experts—Dr. Sophie Bjork‑James (cultural anthropology, studies white nationalism online) and Dr. Jesse De La Cruz (gang expert)—to explain that a tattoo on Cherniak (allegedly the number "211") signaled affinity with white‑supremacist groups and thus motive for a race‑based attack.
The trial judge excluded both experts under the Daubert–Lanigan reliability gatekeeping standard; Hinds was convicted on two counts of assault and battery by means of a dangerous weapon causing serious injury.
On appeal the SJC held the judge abused his discretion in excluding Bjork‑James (her ethnographic/media methodology was sufficiently reliable and relevant), but upheld exclusion of De La Cruz (he failed to articulate a reliable, case‑specific methodology).
The court found exclusion of Bjork‑James prejudicial and reversed and remanded for a new trial; it also addressed, but found non‑prejudicial, certain jury selection and peremptory‑challenge rulings and ruled the trial judge erred in excluding a non‑hearsay statement by Arthur‑Smith.

Issues

Issue	Commonwealth's Argument	Hinds's Argument	Held
Admissibility of expert testimony on cultural meaning of tattoo	Experts’ methodologies unreliable; testimony speculative and not tied to this tattoo	Testimony would show cultural significance of “211” and motive for race‑based attack; methodology (ethnography/media analysis) reliable	Reversed exclusion of Bjork‑James (methodology reliable and relevant); affirmed exclusion of De La Cruz (no reliable, case‑specific methodology shown)
Relevance of tattoo evidence	Irrelevant or improperly offered to prove gang membership/propensity	Relevant to motive and whether victim had racially‑based intent to attack (non‑propensity)	Tattoo‑symbol testimony is relevant to motive; judge erred by conflating relevance with persuasion when excluding Bjork‑James
Jury voir dire — individual indifference inquiry	Judge reasonably exercised discretion; no manifest juror bias	Several jurors indicated they did not presume innocence and received insufficient individual inquiry	Judge erred by not individually questioning four jurors who said they did not presume innocence, but no prejudicial error shown because defense did not exhaust peremptories against the seated jurors
Timing to exercise final peremptory challenge	Trial judge acted within discretion to close peremptory window once jurors were seated	Defense should have been allowed to use last peremptory upon realizing miscount	No abuse of discretion; judge had established timing and denied belated use after panel was concluded
Exclusion of Arthur‑Smith’s out‑of‑court remark (“how the fuck can you prove that?”)	Statement offered for truth = hearsay	Offered to show effect on defendant’s state of mind (not for truth), so admissible	Exclusion was error; the statement was non‑hearsay when offered to show effect on defendant’s belief and reasonableness of his conduct

Key Cases Cited

Daubert v. Merrell Dow Pharms., 509 U.S. 579 (expert‑testimony admissibility and gatekeeping factors)
Commonwealth v. Lanigan, 419 Mass. 15 (Massachusetts application of Daubert standard)
Kumho Tire Co. v. Carmichael, 526 U.S. 137 (Daubert principles apply flexibly to "soft" sciences)
General Elec. Co. v. Joiner, 522 U.S. 136 (courts may exclude expert ipse dixit; distinguish methodology from conclusions)
Commonwealth v. DiCicco, 470 Mass. 720 (review standard for expert‑admissibility rulings)
Commonwealth v. Camblin, 478 Mass. 469 (Daubert‑Lanigan framework in Massachusetts)
Commonwealth v. Barbosa, 457 Mass. 773 (requirements for expert testimony reliability)
Commonwealth v. Canavan's Case, 432 Mass. 304 (flexible application of Daubert to social sciences)