State v. Thomas Mercurio, 89 A.3d 813

Defendant Thomas Mercurio was charged by information in Cranston with threats to a public official, simple assault and battery, resisting arrest, and disorderly conduct following an October 26, 2010 incident.
Trial occurred March 14–20, 2012, with conflicting testimony from Mercurio, a responding officer, and other witnesses about how the arrest unfolded.
Mercurio was convicted only of resisting arrest; the other charges were acquitted.
Mercurio moved in limine to preclude admission of three prior assault convictions for impeachment under Rule 609.
During trial, the State questioned Mercurio in a way that purportedly opened the door to evidence that two prior convictions involved assaults on police officers.
The trial court allowed the impeachment evidence, the conviction was appealed, and the Rhode Island Supreme Court vacated the judgment and remanded for a new trial.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admissibility of prior convictions for impeachment	Mercurio contends Rule 609 requires exclusion due to prejudicial effect.	State argues convictions are probative of credibility and not unduly prejudicial.	No abuse; trial court properly admitted to impeach credibility.
Opening the door to specific convictions on cross-examination	State claims Mercurio opened the door by testimony about attitudes toward police.	Mercurio did not gratuitously discuss attitudes; cross-examination broadened improper questions.	Trial court erred by permitting specific impeachment once the door was opened; cross-examination was improper.
Harmless-error analysis	Admission of prior police-officer assaults was harmless given other evidence.	Prejudicial impeachment without harmless alternative undermined credibility.	Error was not harmless; requires new trial.

State v. McWilliams, 47 A.3d 251 (R.I. 2012) (broad discretion on Rule 609 impeachment admissibility)
State v. Vargas, 991 A.2d 1056 (R.I. 2010) (factors balancing remoteness, nature, and disdain for the law)
State v. McRae, 31 A.3d 785 (R.I. 2011) (abuse of discretion standard for evidentiary rulings)
State v. Gongoleski, 14 A.3d 218 (R.I. 2011) (prior-conviction admissibility and discretion)
State v. Mattatall, 603 A.2d 1098 (R.I. 1992) (factors for credibility-related impeachment value vs. prejudice)
State v. Rosario, 14 A.3d 206 (R.I. 2011) (manufacturing issues for cross-examination and door-opening concept)
State v. O’Dell, 576 A.2d 425 (R.I. 1990) (cross-examination limitations and Rule 404(b) relevance)
State v. Price, 68 A.3d 440 (R.I. 2013) (impeachment of defendant must be careful to avoid improper impeachment)