Background: The perceived culpability of a sexual crime perpetrator may be attributed as a function of both the legality of the substance used when committing the crime and the severity of the sex crime. Objectives: The experiment applied attribution theory to examine the simultaneous impact of substance use legality and sexual crime severity on participants' perceptions of responsibility, blame, and punishment toward sexual crime perpetrators. Methods: Participants (N = 461) in this 4 (substance legality) × 2 (sexual crime severity) experimental design were randomly assigned to one of eight conditions to read a police report depicting a sexual offense. The independent variable of substance legality was manipulated as the perpetrator's usage of no substance (sober), alcohol (legal), marijuana (partially legal), or cocaine (illegal) at the time of the crime. The second independent variable of sexual crime severity was manipulated as the offense of indecent exposure (mild offense) or rape (severe offense) committed by the perpetrator. After reading the manipulated vignette, participants rated outcome measures involving the perpetrator's responsibility, blame (guilt attributions, external attributions, and mental element attributions), and punishment (punishment attitudes and punishment severity). Results: Factorial MANCOVA and ANCOVAs were performed. Participants tended to attribute greater responsibility and blame, but not punishment, toward the sober perpetrator compared to the perpetrator intoxicated with alcohol, marijuana, or cocaine. Additionally, participants attributed significantly greater responsibility, blame, and punishment toward the perpetrator of rape compared to indecent exposure. Conclusions: The experiment supported that both substance legality and sexual crime severity uniquely served as contextual factors that played roles in people's judgments about crimes. Findings offer drug policy information regarding how substance intoxication is perceived as a mitigating excuse in criminal justice systems for committing sexual offenses.
Keywords: Alcohol; attribution theory; cocaine; marijuana; sexual crimes.