One more reason to prevent underage drinking

It's also a reason to implement universal screening for alcohol use by minors:

This study identified the use of alcohol while sad or depressed as a marker for suicidal behavior in adolescents who did not report ideating prior to an attempt, and hence, may not be detected by current strategies for assessing suicide risk. Findings from this study should provide further impetus for alcohol screening among clinicians beyond that motivated by concerns about alcohol and substance use.