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competence, interrogation & confessions
The operative claimJuveniles, especially those age 15 and younger, frequently do not adequately comprehend or appreciate the Miranda warnings they waive: as a group they understand the words of the warnings, and the function and significance of the rights to silence and counsel, less well than adults — raising doubt about whether a juvenile's waiver is knowing and intelligent.
The forensic field broadly accepts that younger adolescents understand and appreciate Miranda warnings less well than adults, which is why simplified juvenile warnings and waiver scrutiny are widely recommended. What is debated is the size of the effect and how it applies to an individual waiver — not the existence of the deficit.
A population-level developmental generalization grounded in standardized assessments of Miranda comprehension and appreciation. The deficit is most pronounced for younger adolescents (roughly 15 and under) and for those with lower cognitive or verbal ability or little prior legal experience; many older or higher-functioning adolescents comprehend adequately. It describes group averages and the validity conditions of a waiver — not whether any particular juvenile understood a particular warning, and not the voluntariness or truth of any statement that followed.
Grisso, T (1980). Juveniles' capacities to waive Miranda rights: An empirical analysis. California Law Review, 68(6), 1134-1166.
Observational · juveniles (approx. 10-16) vs. adults
Using standardized instruments, juveniles — especially those 14 and younger — comprehended the words of the warnings and grasped the function and significance of the rights to silence and counsel substantially less well than adults, raising doubt about whether many juvenile waivers are knowing and intelligent.
Bearing on this claim: Foundational standardized study establishing that juveniles, especially the younger, comprehend and appreciate Miranda warnings less well than adults; source of the field-standard instruments.
doi.org/10.2307/3480263Grisso, T (1981). Juveniles' Waiver of Rights: Legal and Psychological Competence. Plenum Press (Perspectives in Law & Psychology, Vol. 3), 302 pp.
Review
Book-length synthesis concluding that many juveniles lack the legal and psychological competence to validly waive the rights to silence and counsel, integrating standardized comprehension data with juvenile-law procedure.
Bearing on this claim: Book-length synthesis integrating the empirical comprehension data with juvenile-law procedure and the validity of juvenile waivers.
doi.org/10.2307/1288249Owen-Kostelnik, J., Reppucci, N. D., & Meyer, J. R (2006). Testimony and interrogation of minors: Assumptions about maturity and morality. American Psychologist, 61(4), 286-304.
Review
Reviews developmental research showing youth heightens suggestibility and compliance and argues that interrogation techniques designed for adults are especially problematic when used with minors.
Bearing on this claim: Developmental review of why youth heightens suggestibility and compliance and complicates a valid waiver during interrogation.
doi.org/10.1037/0003-066X.61.4.286Redlich, A. D., Silverman, M., & Steiner, H (2003). Pre-adjudicative and adjudicative competence in juveniles and young adults. Behavioral Sciences & the Law, 21(3), 393-410.
Cross-sectional · juveniles and young adults
In an independent (non-Grisso) sample, pre-adjudicative (Miranda) competence and adjudicative competence were strongly related, especially among juveniles, and age and suggestibility predicted both — independently validating the developmental competence deficit and the link between waiver competence and trial competence.
Bearing on this claim: Independent (non-Grisso) study finding Miranda/pre-adjudicative competence is strongly related to adjudicative competence in juveniles, with age and suggestibility predicting both — corroborates the waiver-comprehension deficit beyond the Grisso research program.
doi.org/10.1002/bsl.5434 supporting verified sources
The core evidence is observational group comparison, not experimental, so it shows an association between youth and poorer comprehension rather than a manipulated cause; much of it rests on one dominant research program; foundational data are decades old and predominantly U.S.-based; comprehension measured by instrument may differ from comprehension during a real, stressful interrogation; and group averages mask wide individual variation, so the finding cannot establish that a particular juvenile failed to understand a particular warning.
Last reviewed June 20, 2026