State v. Castellanos, 918 N.W.2d 345

Police heard a gunshot; a nearby SUV had been struck. Occupants pointed toward an apartment building where two men were seen; one held a white cloth/towel.
Officer observed two men in the building hallway outside apartment No. 2; both fled when officers attempted entry and were apprehended a block away.
A white bathmat with what appeared to be blood was found along the fleeing path, wrapped around a Winchester .22 rifle with a defaced serial number; a shortened 20‑gauge shotgun with a spent casing was also found nearby.
Officers observed boot marks and apparent damage to apartment No. 2’s door and, believing someone might be injured, made a warrantless entry; they found drug paraphernalia and later obtained a search warrant to seize narcotics, firearms, and ammunition.
Victim Lorance later identified the recovered .22 as likely his stolen rifle; forensic testing chemically restored the defaced serial number and matched it to Lorance’s record.
Castellanos was convicted of possession of a firearm by a prohibited person and possession of methamphetamine; he appealed, challenging suppression, admission of the stolen‑gun testimony under Neb. Evid. R. 404, and jury instructions on possession.

Issue	Plaintiff's Argument (State)	Defendant's Argument (Castellanos)	Held
Validity of warrantless entry (emergency doctrine)	Officers had reasonable grounds to believe immediate assistance might be needed and could associate the emergency with apartment No. 2	Entry was not justified; no reasonable officer would believe there was an immediate need to enter	Entry was justified under the emergency doctrine; suppression denied
Admissibility of testimony that the .22 was Lorance’s (Rule 404)	Testimony is inextricably intertwined with possession charge because serial‑number match connects gun to defendant	Testimony was other‑acts evidence barred by Rule 404	Evidence was inextricably intertwined and admissible
Sufficiency of evidence if 404 testimony excluded (harmlessness)	Additional independent evidence (ammunition matching, ID documents in closet) linked guns to Castellanos	Admission was prejudicial and required reversal	Any error would be harmless given independent linking evidence
Jury instructions on "possession" (requested instructions refused)	Given instructions (NJI) correctly defined possession and covered substance of defendant’s requests	Requested instructions emphasizing mere presence/proximity should have been given to highlight constructive‑possession standard	Trial court’s instructions, read as a whole, correctly stated law; refusal harmless

State v. Nolt, 298 Neb. 910 (appellate standard for Fourth Amendment suppression review)
State v. Salvador Rodriguez, 296 Neb. 950 (defines emergency doctrine/exigent circumstances)
State v. Burries, 297 Neb. 367 (standard for admitting other‑acts evidence and inextricably intertwined doctrine)
State v. Guilbeault, 214 Neb. 904 (independent‑source/validity of warrants containing both lawful and unlawfully obtained facts)
State v. Parnell, 294 Neb. 551 (standards for reversible error from refusing a requested jury instruction)
State v. Freemont, 284 Neb. 179 (follow Nebraska Jury Instructions when applicable)
State v. Kibbee, 284 Neb. 72 (instructions must be read together; no prejudicial error if they correctly state law)