State v. DeAngelo M., 360 P.3d 1151

Background

Child (DeAngelo M.) was thirteen years and eight days old when three law‑enforcement officers conducted a custodial interrogation that produced inculpatory statements later tying him to a murder.
New Mexico law (Section 32A-2-14(F)) bars admission of statements by children under 13 and creates a rebuttable presumption of inadmissibility for statements by 13‑ and 14‑year‑olds to persons in authority.
The Court of Appeals required the State to prove by clear and convincing evidence, via expert testimony, that a 13‑year‑old had the maturity/intelligence of an average 15‑year‑old to rebut the presumption and suppressed the statements for failure to meet that burden.
The Supreme Court granted certiorari to decide (1) the appropriate standard of proof, (2) what the State must prove to rebut the presumption, and (3) whether expert testimony is required.
The Supreme Court held the State must rebut the presumption by clear and convincing evidence showing (a) the child was warned of constitutional/statutory rights and (b) knowingly, intelligently, and voluntarily waived each right; the recorded interrogation must clearly and convincingly show the child’s answers demonstrate comprehension and the force of will to invoke rights.
On the facts, the recorded advisement and interrogation failed to show clear and convincing comprehension/force of will (confusing warnings, equivocal answers, and continued questioning after Child said “I don’t want to talk anymore”); suppression was affirmed.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Proper burden to rebut presumption under §32A-2-14(F)	State: preponderance of the evidence using §32A-2-14(E) totality factors	Child: higher burden (Court of Appeals required clear and convincing)	Clear and convincing evidence is required
What the State must prove to rebut the presumption	State: proof that waiver was knowing, intelligent, voluntary under §32A-2-14(E) suffices	Child: must prove the child had maturity to understand rights (Court of Appeals framed as 15‑year‑old benchmark)	State must prove by clear and convincing evidence that at the time the child understood each right and had the force of will to assert them; focus on child’s actual on‑record comprehension, not a categorical age benchmark
Role of expert testimony	State: lay evidence and totality factors suffice	Child/Ct. of Appeals: expert testimony required to assess a 13/14‑year‑old’s capacity	Expert testimony may assist but is not essential; recorded, on‑the‑record demonstration of comprehension is primary

Key Cases Cited

Miranda v. Arizona, 384 U.S. 436 (1966) (establishes warnings and waiver framework for custodial interrogation)
Addington v. Texas, 441 U.S. 418 (1979) (explains purpose of burden‑of‑proof standards)
In re Winship, 397 U.S. 358 (1970) (discusses burdens of proof in adjudications)
State v. Jonathan M., 109 N.M. 789, 791 P.2d 64 (1990) (discusses categorical exclusion for children under fifteen prior to statutory revision)
State v. Martinez, 127 N.M. 207, 979 P.2d 718 (1999) (addresses waiver standards under §32A-2-14)
Jade G. v. State, 141 N.M. 284, 154 P.3d 659 (2007) (interprets legislative distinctions among child age groups regarding admissibility)