| http://www.w3.org/ns/prov#value | - nly ???some of the time??? or less on the survey, reported having used a fictitious drug included in the survey as a validity screen, or reported that they had used 2 of 3 drugs (marijuana, inhalants, or other drugs) on 40 or more occasions during the past month as shown in Table 3).The proportion of students in the analysis sample who did not respond to the delinquency and drug use questions was
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