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Psychopathy and callous-unemotional designations applied to adolescents carry moderate group-level predictive validity for offending (meta-analytic r ≈ .24, with some incremental value beyond antisocial history), but their stability into adulthood is genuinely contested — traits decline on average and roughly a third of high-scoring institutionalized youth show substantial decreases over ten years, while serious-offender cohorts show majority rank-order stability — so an adolescent "psychopath" label cannot be treated as a finding of fixed adult character in sentencing or disposition.