A seven-year test of the gang membership–psychopathic traits link, following 1,315 serious adolescent offenders through the Pathways to Desistance study. The answer, it turns out, is not either/or.
Gang scholarship has long argued three different stories about psychopathic traits and gang membership. Toggle between them to see how each predicts psychopathic traits should move around the onset and end of gang membership.
A longitudinal study of 1,354 serious adolescent offenders in Philadelphia, PA and Phoenix, AZ, interviewed at baseline and up to ten follow-up waves across seven years. After requiring at least three valid waves per respondent, the analytic sample is 1,315 adolescents.
Individuals who score higher on psychopathic traits are more likely to be gang members than individuals who score lower — a between-individual difference.
Psychopathic traits are higher during active periods of gang membership compared to non-active periods — a within-individual change.
A note on scoring: the YPI figures here use prorated (person-mean imputed) scores, not Pathways' raw public summated scores — the same scoring approach examined and validated in a companion paper, Tostlebe (2026), Know Your (Secondary) Data Inside and Out, Crime & Delinquency, which found the prorated and summated approaches produce nearly identical conclusions.
Across every domain of psychopathic traits, adolescents who scored higher were more likely to become gang members the following wave — even after accounting for neighborhood disorder, victimization, living arrangement, and ethnoracial identity.
| Domain | Coefficient (b) | Odds ratio | Significance |
|---|---|---|---|
| Overall psychopathic traits | 1.19 | 3.30 | p < .001 |
| Interpersonal (grandiose–manipulative) | 0.78 | 2.19 | p < .01 |
| Affective (callous–unemotional) | 1.42 | 4.14 | p < .001 |
| Behavioral (impulsive–irresponsible) | 1.15 | 3.17 | p < .001 |
Holding each person's own baseline constant, psychopathic traits run higher during the waves someone is an active gang member than during the waves they are not — for three of four domains.
Interpersonal traits — charm, manipulation, grandiosity — did not significantly increase during active gang membership (p = .096). The author suggests these traits may take longer to develop, or may concentrate more in gang leaders than in the typical member.
Selection and facilitation are not competing explanations — the data support both at once. Adolescents with elevated psychopathic traits are more likely to join gangs in the first place, and gang membership then reinforces and intensifies those traits while it's active.
FINDING Psychopathic traits function as both a source and a consequence of gang membership — consistent with the enhancement model adapted from Thornberry and colleagues' (1993) selection-facilitation-enhancement framework for gang offending.
Figure 1's before/after trajectories are the theoretical prediction — but the author is upfront that the panel itself observed few of those actual transitions. Most participants who ever reported gang membership had already joined before the study began, and few joined or left during the seven-year follow-up window. That's why the within-individual test compares active vs. non-active waves, rather than a clean pre-gang-to-post-gang window.
Because so few people transitioned into or out of gangs mid-study, the "facilitation" test in Figures 1 and 3 leans on comparing active-membership waves to non-active waves for the same person — a good proxy, but not a direct before/after comparison. The author flags this explicitly as a reason to treat the enhancement finding as preliminary, and calls for future panels that begin tracking youth earlier, around age 10, before most gang joining happens.
Because psychopathic traits are malleable rather than fixed, the strongest response is a combination strategy that works at both the individual and group level.
Psychopathic traits can move in either direction. The same social influence that intensifies these traits during gang membership is evidence they can also be reduced — through cognitive-behavioral therapies that target thinking patterns about self, others, and society.
Adolescence is the window. Because psychopathic traits and gang joining both tend to emerge during adolescence, intervention before gang group processes take hold may be more effective than intervention after.
Individual-only or group-only strategies each address half the picture. Evidence for facilitation supports group-level programs (focused deterrence, Cure Violence, comprehensive gang models); evidence for selection supports individual-level programs (CBT). The findings favor pairing both.