State v. Serna, 305 P.3d 936

Defendant Hector Flores Serna, Jr. was charged in a prosecution including first-degree murder and distribution of an imitation controlled substance (baking soda packaged to look like cocaine) under New Mexico's Imitation Controlled Substances Act (ICSA).
The State sought to admit evidence of Serna's two prior convictions—possession of a controlled substance (methamphetamine) and credit card fraud—under the ICSA provision allowing consideration of prior convictions related to controlled substances or fraud.
The trial court admitted the prior-conviction evidence despite doubts about admissibility, and provided a jury instruction limiting consideration to the ICSA charge.
Eyewitness Virginia Sanchez testified that Serna sold baking soda packaged to appear as cocaine and shot Vargas after a dispute over the substance; a 911 recording supported her identification of Serna as the shooter.
The jury found Serna guilty of first-degree murder and distribution of an imitation controlled substance; his life sentence was enhanced by habitual offender and firearm enhancements, both challenged on appeal.
The New Mexico Supreme Court held that the prior-conviction evidence was inadmissible under Rule 11-404(B) but determined the error was harmless; the life sentence enhancements were improper and remanded for sentencing correction.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Are prior convictions admissible under ICSA when already subject to the rules of evidence?	State argues ICSA authorizes consideration of prior convictions related to controlled substances or fraud.	Serna contends prior convictions are inadmissible under Rule 11-404(B) and not justified by ICSA.	Prior convictions inadmissible under Rule 11-404(B); admission was error but harmless.
Was the erroneous admission of prior convictions harmless error in light of the record?	State contends the convictions aided the ICSA prosecution and the error was harmless.	Serna argues the convictions prejudiced the jury and violated evidentiary rules.	Error deemed harmless; sufficient independent evidence supported guilt.
Are the sentencing enhancements for habitual offender and firearm authorized in a capital (murder) case?	State concedes enhancements were proper under statute.	Serna asserts enhancements apply only to noncapital felonies and thus were unauthorized for murder.	Enhancements improper; remand to correct the sentencing.

State v. Belanger, 146 N.M. 357, 210 P.3d 783 (2009) (Court recognizes rulemaking authority over evidentiary rules)
Ammerman v. Hubbard Broadcasting, Inc., 89 N.M. 307, 551 P.2d 1354 (1976) (Rule-making authority over procedure rests in the Supreme Court)
Albuquerque Rape Crisis Ctr. v. Blackmer, 138 N.M. 398, 120 P.3d 820 (2005) (harmonious co-existence of legislative acts with evidentiary rules)
State v. Lucero, 114 N.M. 489, 840 P.2d 1255 (Ct. App. 1992) (proponent must articulate the consequential fact for other-acts evidence)
State v. Elinski, 1997-NMCA-117, 124 N.M. 261, 948 P.2d 1209 (1997) (requires real probative value beyond propensity for other-acts evidence)
State v. Tollardo, 2012-NMSC-008, 275 P.3d 110 (2012) (harmless error framework for non-constitutional evidentiary errors)
State v. Kerby, 2005-NMCA-106, 138 N.M. 232, 118 P.3d 740 (2005) (balance probative value against unfair prejudice under Rule 11-403)
State v. Gallegos, 2007-NMSC-007, 141 N.M. 185, 152 P.3d 828 (2007) (need cogent rationale for admitting other-acts evidence beyond Rule 11-404(B) listings)
State v. Paiz, 2011-NMSC-008, 149 N.M. 412, 249 P.3d 1235 (2011) (illegal sentence may be challenged on appeal)