Abstract
<h3>To the Editor.—</h3> Zwerling et al<sup>1</sup>were unable to control for the effects of alcohol use in their study of the association between preemployment drug screening results and employment outcomes. We believe that the lack of data regarding alcohol use is a major flaw in this study. We examined the relationship of marijuana and cocaine use to alcohol use in 4624 black and white men and women, 20 to 32 years of age, who were examined in 1987 and 1988 during the second cycle of examinations in a longitudinal study of cardiovascular risk factors.<sup>2</sup><i>Current alcohol use</i>was defined as usual consumption of one or more alcoholcontaining drinks per week. Average daily alcohol intake was quantified by multiplying the usual number of drinks of beer, wine, and liquor during a week by estimates of the alcohol content of each of these beverages and dividing by 7.<sup>3</sup> Current
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