State v. Leopoldo Belen, 220 A.3d 1224

Defendant Leopoldo Belen and the victim (pseudonym "Emily") were romantically involved and lived together in Woonsocket.
Emily testified that Belen sexually and physically assaulted her in their apartment on April 1, 2014, including vaginal and anal examinations at a hospital and alleged rape with a hair-mousse can; she fled clothed only in a sheet and reported the assault to police.
Forensic testing found Belen’s DNA on the hair-mousse can and on swabs from Emily, though the expert conceded some swab DNA could reflect consensual sex 36–48 hours earlier.
A recorded jail call from Belen to Emily (with ACI origin redacted by court order) was played at trial; in the call Belen apologized and said "even monsters make mistakes."
During closing argument the prosecutor (1) inadvertently referred to the “ACI” and (2) related a personal comment about having a speculum exam when describing the sexual-assault kit; the trial justice deemed both improper but denied a mistrial.
The jury convicted Belen on four counts of first-degree sexual assault; he was sentenced to four concurrent life terms and appealed, arguing the prosecutor’s remarks required a mistrial.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether inadvertent reference to the ACI during closing required a mistrial	The remark was inadvertent, insubstantial, and harmless; a mistrial was unnecessary	The ACI reference prejudiced the jury by revealing incarceration and required mistrial	Remark was improper but not so prejudicial as to require a mistrial; trial justice did not abuse discretion
Whether prosecutor’s personalizing comment (speculum) was improper vouching/golden-rule and required a mistrial	Any error was waived or harmless; trial instructions and lack of contemporaneous objection cure prejudice	The personalization vouched for the victim and inflamed the jury, requiring a mistrial	Defense waived the argument by not timely objecting/requesting curative instruction; on merits the comment was improper but not prejudicial enough to render trial unfair

State v. Roscoe, 198 A.3d 1232 (R.I. 2019) (prosecutor latitude in closing; defer to trial justice’s view of prejudice)
State v. Boillard, 789 A.2d 881 (R.I. 2002) (circumstances where post-argument objection may preserve error)
State v. Pugliese, 362 A.2d 124 (R.I. 1976) (reference to incarceration can be prejudicial and warrant reversal)
State v. Martinez, 624 A.2d 291 (R.I. 1993) (mistrial required only when prejudice cannot be cured by instruction)
State v. Whitfield, 93 A.3d 1011 (R.I. 2014) (preservation rule: contemporaneous objection plus request for curative instruction or mistrial required)
State v. Dubois, 36 A.3d 191 (R.I. 2012) (trial-justice discretion in mistrial/pass decisions entitled to great weight)
Jaiman v. State, 55 A.3d 224 (R.I. 2012) (definition and prohibition of prosecutorial vouching)