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Definition of Controlled substance

Controlled substance Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
A drug or other substance, or immediate precursor included in Schedule I, II, III, IV, or V of the Controlled Substances Act. (JP 3-07.4)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Controlled substance Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
A controlled substance is generally a drug or chemical whose manufacture, possession, or use is regulated by a government, such as illicitly used drugs or prescription medications that are designated a Controlled Drug.

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Controlled substance Definition from Law Dictionaries & Glossaries
Law Dictionary
A drug whose general availability is restricted, anysubstance that is strictly regulated or outlawed because of its potential forabuse or addiction. Controlled substances include narcotics, stimulants,depressants, hallucinogens, and cannabis.
Controlled substance Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. a drug or chemical substance whose possession and use are controlled by law
(hypernym) drug
(hyponym) cannabis, marijuana, marihuana, ganja