State v. Rodriguez, 83 A.3d 595

On Feb. 7, 2008, Angel Salvador Diaz was stabbed; he later identified Luis Rodriguez as the attacker at trial. Two market employees (William and Franklin Ramirez) corroborated the identification and events.
Diaz initially told police he could not identify his assailants and earlier misidentified them as two black males; he later, after hospitalization, identified Rodriguez from a photo array.
On learning Diaz had used another person’s identity and Social Security number to obtain over $250,000 in medical treatment and was unlawfully present in the U.S., the prosecutor arranged for counsel (Aaron Romano) to advise Diaz.
Romano negotiated an immunity agreement: the state would not prosecute Diaz for the identity fraud, would not share the information with other agencies, and would assist with citizenship in exchange for Diaz’s truthful testimony.
At trial the state called Romano to explain the terms and purpose of the immunity agreement over Rodriguez’s objection; Rodriguez argued this improperly bolstered Diaz’s credibility and, alternatively, that the state had to show a compelling need to call counsel as a witness.
The jury convicted Rodriguez of first‑degree assault; on appeal the Connecticut Appellate Court affirmed, and the Connecticut Supreme Court granted certification but concluded any error in admitting Romano’s testimony was harmless.

Issue	Plaintiff's Argument (State)	Defendant's Argument (Rodriguez)	Held
Admissibility of witness’s attorney to explain an immunity agreement	Romano’s testimony was relevant to explain the agreement’s terms and to help the jury evaluate Diaz’s credibility.	Testimony was irrelevant or unduly prejudicial because it improperly bolstered Diaz’s credibility; calling witness’s attorney required a showing of compelling need.	Appellate Court: admission within trial court’s discretion; Supreme Court assumed possible error but did not decide admissibility, finding any error harmless.
Harmlessness of admitting Romano’s testimony	Any explanation of the immunity agreement was minimal and did not alter the strong independent evidence; therefore any error was harmless.	Testimony likely bolstered Diaz and was important because state’s case depended heavily on his credibility; error was prejudicial.	Supreme Court: error (if any) was harmless — fair assurance verdict not substantially affected given corroborating eyewitness testimony, jury instruction about credibility, and limited import of Romano’s testimony.

State v. Ritrovato, 280 Conn. 36 (Conn. 2006) (articulates harmless‑error factors for nonconstitutional evidentiary rulings)
State v. Boyd, 295 Conn. 707 (Conn. 2010) (improperly admitted evidence found harmless where strong independent evidence existed)
State v. Bonner, 290 Conn. 468 (Conn. 2009) (even if some testimony improperly admitted, conviction upheld due to corroborating evidence)
State v. Finan, 275 Conn. 60 (Conn. 2005) (admission of challenged identification testimony held harmful where little independent corroboration existed)
State v. Peeler, 265 Conn. 460 (Conn. 2003) (compelling‑need test for calling counsel as witness explained)
State v. Wilson, 308 Conn. 412 (Conn. 2013) (defines relevancy standard)
State v. Rodriguez, 133 Conn. App. 721 (Conn. App. 2012) (Appellate Court opinion affirming admission of Romano’s testimony and upholding conviction)