| http://www.w3.org/ns/prov#value | - With regard to access, the NSDUH reported that more than half of past-year nonmedical users of prescription medications over the age of 12 years obtained the medication from a friend or relative for free.1 The MTF survey echoes these results, noting that, among 12th-graders who reported nonmedical use of amphetamines, tranquilizers, or narcotics other than heroin within the last year, more than ha
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