Background
On January 15, 2017, two people were shot and killed in Bernalillo County, New Mexico. Two days later, a Texas sheriff’s deputy stopped a vehicle in Wheeler County, Texas for a defective headlight. Adrian Causey was a front-seat passenger. After issuing a warning and returning the driver’s documents, the deputy continued questioning and ultimately obtained the driver’s admission that there was a marijuana joint in the car. The deputy then patted down Causey, handcuffed him, and recovered a firearm magazine from his pocket. After further questioning, Causey admitted a gun was on the floor behind his seat. A search located the handgun, which was eventually linked to the New Mexico murders.
Causey was indicted in New Mexico on two counts of first-degree murder, conspiracy, armed robbery, and related charges. He moved to suppress the firearm and related evidence, arguing the warrantless vehicle search violated both the federal Fourth Amendment and Article II, Section 10 of the New Mexico Constitution. The State responded that Texas law should govern because the search occurred there and was lawful under Texas constitutional standards.
The Bernalillo County district court granted the suppression motion, holding that admissibility in a New Mexico court is governed by New Mexico’s exclusionary rule under Article II, Section 10, and that the search violated that provision. The State appealed, presenting the New Mexico Supreme Court with a question of first impression: whether New Mexico’s constitutional exclusionary rule applies to a search conducted in another state that was lawful under that state’s law.
The Court’s Holding
The New Mexico Supreme Court unanimously affirmed the suppression order. The Court held that Article II, Section 10 of the New Mexico Constitution applies to defendants prosecuted in New Mexico courts, and that when the State proffers evidence gathered by another state’s law enforcement in violation of that provision, the evidence is inadmissible in New Mexico state courts. The geographic location of the search and the identity of the searching officers are irrelevant to the admissibility analysis; what matters is that the State is attempting to use the evidence in a New Mexico proceeding.
The Court grounded its reasoning in prior decisions applying New Mexico’s exclusionary rule to searches conducted by federal border patrol agents — State v. Snyder (1998) and State v. Cardenas-Alvarez (2001) — and extended their rationale from the federal-state context to the interstate context. Unlike the federal exclusionary rule, New Mexico’s exclusionary rule under Article II, Section 10 is not primarily about deterrence or judicial integrity. Its core purpose is to effectuate the constitutional right of the accused to be free from unreasonable searches and seizures, and that purpose is served by excluding tainted evidence regardless of which sovereign’s agents conducted the search.
The Court also rejected the State’s alternative arguments. It held that entering another state does not constitute consent to having that state’s law govern admissibility in a New Mexico prosecution, and that applying Article II, Section 10 to out-of-state evidence does not produce impracticable results — the ruling does not bar all out-of-state evidence, only evidence obtained in a manner that would violate New Mexico’s constitution. The Court further declined to adopt the reasoning from special concurrences in Snyder and Cardenas-Alvarez that would have limited Article II, Section 10’s reach.
Key Takeaways
- New Mexico’s exclusionary rule under Article II, Section 10 applies in New Mexico courts to evidence gathered by out-of-state law enforcement, even if the search was lawful under the other state’s law — a question of first impression for the court.
- New Mexico’s exclusionary rule is rights-based, not deterrence-based: suppression is required to vindicate the defendant’s individual constitutional rights, not to alter the behavior of out-of-state or federal officers.
- A defendant does not waive New Mexico constitutional protections simply by traveling to another state; those protections attach in the New Mexico prosecution, not to the location of the search.
- The ruling does not categorically exclude all out-of-state evidence — only evidence obtained in a manner that would violate Article II, Section 10 if evaluated under New Mexico’s constitutional standards.
Why It Matters
This decision meaningfully expands the reach of New Mexico’s state constitutional search-and-seizure protections beyond what the federal Fourth Amendment requires. Because many states (including Texas) apply less expansive exclusionary rules and do not treat suppression as a rights-effectuation mechanism, evidence lawfully obtained elsewhere may now be inadmissible in New Mexico prosecutions. Defense attorneys handling cases with multi-state investigative footprints — particularly where evidence was collected in traffic stops, border encounters, or law enforcement operations in other states — should evaluate that evidence against New Mexico’s constitutional standard, not merely the law of the state where the search occurred.
For prosecutors, the decision signals that the State cannot rely on the lawfulness of a search under another jurisdiction’s law as a sufficient basis for admissibility in New Mexico courts. It also forecloses a “silver platter” theory under which New Mexico could benefit from evidence gathered by out-of-state agents under looser constitutional standards. The ruling invites defense challenges to out-of-state evidence in future cases and may influence how New Mexico law enforcement coordinates with agencies in other states during joint investigations.