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Definition of controlled substance noun from the Oxford Advanced Learner's Dictionary

controlled substance

noun
 
/kənˌtrəʊld ˈsʌbstəns/
 
/kənˌtrəʊld ˈsʌbstəns/
(specialist)
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  1. an illegal drug
    • to be arrested for possession of a controlled substance
See controlled substance in the Oxford Advanced American Dictionary
influence
verb
 
 
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