United States v. Prieto, 565 F. App'x 758

Prieto was arrested after officers stopped a vehicle for a loud-noise violation; officers observed a glass pipe in the center console and noted Prieto’s bloodshot, slurred appearance, shifting the inquiry toward drugs.
After backup arrived and officers removed the passenger (Saul Galvan), officers saw a handgun on the passenger side and then observed a loaded .380 handgun on the driver’s floorboard; Prieto and Galvan were arrested.
Prieto was charged under 18 U.S.C. §§ 922(g)(1) and 924(a)(2) for possession of a firearm as a felon; a jury convicted him and he was sentenced to 100 months’ imprisonment.
At trial the district court admitted evidence of the pipe, the drug dog deployment/context, and the gun found on the passenger side as res gestae to explain the stop and officers’ actions; the court limited testimony about drug identification and repeatedly instructed the jury that this was not a drug case.
The government introduced testimony establishing Prieto’s prior felony conviction (stipulated); the parole officer and Prieto’s mother testified that he was a convicted felon during foundation for a recorded jail call. Prieto declined to testify after receiving a court advisement about impeachment by prior convictions.
Prieto appealed, arguing evidentiary errors (admission of drug and passenger-weapon evidence), improper reference to his felon status, and that the court’s advisement about the right to testify was misleading; the Tenth Circuit affirmed.

Issue	Prieto’s Argument	Government’s Argument	Held
Admissibility of drug paraphernalia and drug-dog testimony	Evidence irrelevant or unduly prejudicial under Rule 403 and not part of res gestae	Evidence was res gestae—necessary to explain officers’ conduct and was not unfairly prejudicial given limiting instructions	Court affirmed admission: res gestae and not unduly prejudicial
Admission of gun found on passenger side	Evidence should be excluded as irrelevant or prejudicial, not Prieto’s weapon	Necessary to explain officers’ actions (why they drew weapons and removed occupants); jury instructed passenger owned that gun	Court affirmed admission as part of res gestae with limiting instruction
Testimony that Prieto was a felon (prior conviction)	Stipulation should have foreclosed any testimony about felony status per Old Chief and Rule 404(b)	Government needed to establish prior-conviction element and to authenticate recorded call; testimony did not describe nature of prior offense	Court held no violation: witnesses did not discuss nature/substance of prior felony; admissible to establish element and for impeachment foundation
District court’s advisement about right to testify (Curtis advisement)	Advisement misled because it referenced state (Colorado) standards allowing broader impeachment than federal Rule 609	Court followed established procedure; defendant did not object at trial	Court affirmed; failure to object forfeited review and no plain-error argument was made

United States v. Ford, 613 F.3d 1263 (10th Cir. 2010) (res gestae admission rule and relevance of inextricably intertwined acts)
United States v. Leonard, 439 F.3d 648 (10th Cir. 2006) (abuse-of-discretion standard for evidentiary rulings)
United States v. Cerno, 529 F.3d 926 (10th Cir. 2008) (Rule 403 undue-prejudice standard and jury emotional-bias concerns)
United States v. Sanchez, 725 F.3d 1243 (10th Cir. 2013) (risk of guilt-by-association and Rule 403 sensitivity)
Old Chief v. United States, 519 U.S. 172 (1997) (limits on proof of prior convictions to avoid unfair prejudice in § 922(g)(1) prosecutions)
United States v. Wacker, 72 F.3d 1453 (10th Cir. 1995) (use of stipulations or redactions to inform jury only of existence of prior felony)
United States v. Blechman, 657 F.3d 1052 (10th Cir. 2011) (forfeiture of appellate review where defendant fails to object below and does not invoke plain-error standard)