In addition to the ratings of externalizing problems, illegal behavior was examined to verify the model predictions against particularly important and costly societal outcomes, including arrests, injecting illegal drugs, illegal drug use, and drunk driving. At age 27, adults reported whether they had ever been arrested, and 138 people (30%) reported that they had been arrested. At age 27, adults also reported whether they had ever injected an illegal drug (2%), used recreational drugs for non-medical purposes in the past 6 months (excluding alcohol and nicotine) (26%), and driven after drinking 5 or more alcoholic drinks in a row in the past year (15%).
