Controlled substance
drug whose manufacture, possession, or use is regulated by a government
A controlled substance is generally a drug or chemical whose manufacture, possession, and use is regulated by a government, such as illicitly-obtained drugs or prescription medications that are designated by law. Some treaties, notably the Single Convention on Narcotic Drugs, the Convention on Psychotropic Substances, and the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, provide internationally agreed-upon "schedules" of controlled substances, which have been incorporated into national laws; however, national laws usually significantly expand on these international conventions.
Some precursor chemicals used for the illegal production of 'controlled drugs' are also controlled substances in many countries, even though they may lack the pharmacological effects of the drugs themselves. Substances are classified according to schedules and consist primarily of potentially psychoactive substances and anabolic steroids. The controlled substances do not include many prescription items such as antibiotics.
Laws and enforcement
In the United States, the Drug Enforcement Administration is the federal government agency responsible for suppressing the misuse of drugs and distribution by enforcing the Controlled Substances Act, which regulates activities with both the drugs themselves and certain precursors. Some U.S. states have additional restrictions for substances which might or might not be regulated by the federal government. During the Obama Administration, the federal government also voluntarily suspended enforcement of federal laws restricting marijuana where people were operating in compliance with state law.
Some states in the U.S. have statutes against health care providers self-prescribing and/or administering substances listed in the Controlled Substance Act schedules. This does not forbid licensed providers from self-prescribing medications not on the schedules.
“Controlled substance” enters the record as drug whose manufacture, possession, or use is regulated by a government. Crown Archives preserves that source wording while asking what Controlled, substance and drug can confirm, complicate or overturn.
Why this record matters
“Controlled substance” is worth following because a concise public description often conceals a longer documentary argument. Here, Controlled, substance and drug provides the most credible route into that argument.
Contemporary correspondence, administrative files and participant testimony can test how later narratives organized the event or institution. The source revision retrieved here is dated Sep 5, 2026. The linked authority identifier is Q850692. None of the 0 selected statements returned an explicit reference.
Later summaries often reconcile disputed chronology or motive more neatly than the contemporary record permits. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Compare institutional narratives with records created by participants and affected communities. Dates and formal titles are useful anchors, but not substitutes for context.
- Event chronology
- Institutional context
- Locating named record creators
Contemporary correspondence, government or organizational records, oral histories and cited historical scholarship.
Three-step research path
- Establish the record: confirm the title “Controlled substance”, its source revision and the description used here.
- Expand the search: follow Controlled substance primary sources, Controlled substance archive and Controlled research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Controlled substance”?
- What chronology connects this entry to wider political or social change?
- Which voices are present, absent or mediated by the institution?
Search terms from this dossier
This entry incorporates text from “Controlled substance” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.