Alaska Natives' culturally based propensity toward truth-telling is said to result in overrepresentation in prison because it is thought they are more likely to confess when interrogated. Using data gathered for the Arrestee Drug Abuse Monitoring program, this study considered the assertion that Alaska Natives are more truthful than non-Natives. The criterion validity of self-reported drug use measures was examined using urinalysis results. The hypothesis that the differences between self-reported drug use and urinalysis results would be smaller for Alaska Natives than for non-Natives was not confirmed; most arrestees - both Alaska Native and non-Native - were truthful about their drug use.