Commonwealth v. Orbin O., a juvenile, 89 N.E.3d 1151

A charter school vice-principal filed a private-party application under G. L. c. 218, § 35A alleging the 14‑year‑old juvenile committed assault and battery by shouldering a paraprofessional in class; a clerk‑magistrate held a show cause hearing and issued a delinquency complaint.
The juvenile moved to dismiss the complaint before arraignment; at the hearing the Juvenile Court judge reviewed the complaint materials and granted dismissal, finding no probable cause the juvenile acted intentionally given his IEP-backed de‑escalation plan.
The Commonwealth appealed the dismissal, arguing the record established probable cause and that the judge improperly considered what the Commonwealth characterized as an affirmative defense (conduct consistent with an IEP).
The SJC reviewed probable cause de novo and analyzed (1) whether the judge erred on the merits of probable cause for intentional assault and battery and (2) the scope of a Juvenile Court judge’s authority to dismiss a § 35A private‑party delinquency complaint before arraignment.
The Court concluded the judge erred on the probable cause finding as to intent, vacated the dismissal, and clarified when a judge may consider dismissal of a private‑party complaint prior to arraignment (distinguishing cases where the prosecutor has affirmatively adopted the complaint by moving for arraignment).

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether record established probable cause for intentional assault and battery	Record showed physical contact (elbow) and reasonably trustworthy facts supporting intent	Juvenile argued his conduct was justified/consistent with IEP de‑escalation, negating intent	Court: judge erred — record supported probable cause as to intentional touching; dismissal on that basis vacated
Whether a Juvenile Court judge may dismiss a § 35A private‑party delinquency complaint pre‑arraignment	Commonwealth: judge lacked authority to dismiss where complaint supported by probable cause	Juvenile: judge may dismiss in best interests of child and interests of justice when complaint initiated by private party	Court: where prosecutor has affirmatively moved for arraignment, judge may not dismiss a valid complaint; but where prosecutor has not adopted complaint, judge may review whether clerk‑magistrate abused discretion (including considering best interests/interests of justice)

Commonwealth v. Humberto H., 466 Mass. 562 (2013) (probable cause review from complaint application four corners standard)
Commonwealth v. Porro, 458 Mass. 526 (2010) (definition of intentional assault and battery)
Victory Distribs., Inc. v. Ayer Div. of the Dist. Court Dep't, 435 Mass. 136 (2001) (§ 35A uses discretionary "may"; prosecutor’s later decision to prosecute precludes clerk‑magistrate/judge from blocking prosecution)
Bradford v. Knights, 427 Mass. 748 (1998) (private party may seek criminal complaint but has no judicially cognizable right to prosecution)
DiBennadetto, 436 Mass. 310 (2002) (after issuance of § 35A complaint, remedy is motion to dismiss for challenges to complaint validity)
Matter of Powers, 465 Mass. 63 (2013) (description of § 35A show cause hearing procedure)
Commonwealth v. O'Dell, 392 Mass. 445 (1984) (probable cause requires less than proof beyond a reasonable doubt)
Whitley v. Commonwealth, 369 Mass. 961 (1976) (prosecution rights belong to the Commonwealth, not private parties)