
The Controlled Substances Act (CSA) establishes a federal policy to regulate the manufacturing, distribution, importation, exportation, and use of controlled substances. It was passed by the 91st United States Congress and signed into law by President Richard Nixon in 1970. The CSA places all substances under the existing federal law into one of five schedules, based on factors such as medical use, potential for abuse, and safety or dependence liability. The scheduling of substances can be initiated by the Drug Enforcement Administration (DEA), the Department of Health and Human Services (HHS), or by petition from interested parties, including drug manufacturers and medical societies. While the CSA sets the framework for controlled substance regulation, individual states have the authority to adopt, amend, or enforce their own schedules and regulations, which may differ from federal law. This results in variations in substance control policies across the country.
| Characteristics | Values |
|---|---|
| Which government body makes substance laws? | Federal government |
| Which act establishes federal drug policy? | The Controlled Substances Act (CSA) |
| Which two agencies determine which substances are added or removed from the schedules? | Drug Enforcement Administration (DEA) and Food and Drug Administration (FDA) |
| What are the factors for determining the schedule of a substance? | Potential for abuse, scientific evidence of pharmacological effect, state of current scientific knowledge, history and current pattern of abuse, scope, duration and significance of abuse, risk to public health, and psychic or physiological dependence liability |
| What are the five schedules based on? | Substance's medical use, potential for abuse, and safety or dependence liability |
| Can states make substance laws? | Yes, states can make substance laws, but federal laws establish minimum requirements above which states may impose stricter or additional requirements |
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What You'll Learn

The Controlled Substances Act (CSA)
The CSA places all substances that were previously regulated under federal law into one of five schedules. This placement is based on the substance's medical use, potential for abuse, and safety or dependence liability. The CSA also provides a mechanism for substances to be controlled (added to or transferred between schedules) or decontrolled (removed from control). The procedure for these actions is found in Section 201 of the Act (21 U.S.C. §811).
The scheduling of a drug or substance is determined by the Drug Enforcement Administration (DEA) and the Food and Drug Administration (FDA), although the statute passed by Congress created the initial listing. Proceedings to add, delete, or change the schedule of a substance may be initiated by the DEA, the Department of Health and Human Services (HHS), or by petition from any interested party, including the manufacturer of a drug, a medical society, or an individual practitioner.
The CSA establishes a federal policy to regulate the manufacturing, distribution, importation, exportation, and use of controlled substances. It also provides for the federal regulation of precursors used to manufacture some of the controlled substances. The DEA list of chemicals is modified when the United States Attorney General determines that illegal manufacturing processes have changed.
The CSA has been amended several times since its original enactment. Notable amendments include the 2010 Secure and Responsible Drug Disposal Act, which allowed pharmacies to create take-back programs for controlled medications, and the 2017 Protecting Patient Access to Emergency Medications Act, which included registration for Emergency Medical Services to administer controlled substances.
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Scheduling of substances
The Controlled Substances Act (CSA) establishes a federal policy to regulate the manufacturing, distribution, importation, exportation, and use of regulated substances. It places all substances that were in some manner regulated under existing federal law into one of five schedules. This placement is based on the substance's medical use, potential for abuse, and safety or dependence liability. The scheduling procedure is triggered automatically in many states by a federal scheduling determination, and the medication is presumptively placed into the same schedule as the federal schedule.
The CSA provides a mechanism for substances to be controlled (added to or transferred between schedules) or decontrolled (removed from control). Proceedings to add, delete, or change the schedule of a substance may be initiated by the Drug Enforcement Administration (DEA), the Department of Health and Human Services (HHS), or by petition from any interested party, including the manufacturer of a drug or a medical society.
The CSA's scheduling criteria include a substance's potential for abuse, its currently accepted medical use in treatment, and compliance with international treaties. Any new drug that is "perceived" by the DEA as likely to be abused and that is so new that there is no currently accepted medical use for it and whose safety is not proven for medical use receives a Schedule I rating. Schedule I drugs cannot be researched without government approval.
In determining a substance's schedule, certain factors are required to be considered. These factors are listed in Section 201 (c), [21 U.S.C. § 811 (c)] of the CSA and include the substance's actual or relative potential for abuse, scientific evidence of its pharmacological effect, the state of current scientific knowledge regarding the substance, its history and current pattern of abuse, the scope, duration, and significance of abuse, the risk to public health, and its psychic or physiological dependence liability.
While the CSA establishes federal policy, individual states may also implement their own scheduling procedures and regulations. Some states reschedule controlled substances independently of the federal government and more restrictively. State laws and regulations can significantly impact the discovery, development, and marketing of anti-addiction medications, especially if the medication is a controlled substance. For example, the veterinary medication xylazine is not federally scheduled, but states like Ohio and West Virginia have scheduled this drug.
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Federal vs. state government powers
In the United States, the Controlled Substances Act (CSA) establishes a federal policy to regulate the manufacturing, distribution, importation, exportation, and use of regulated substances. The CSA places all substances that were in some manner regulated under existing federal law into one of five schedules. This placement is based on the substance's medical use, potential for abuse, and safety or dependence liability.
The federal government's powers are outlined in the Constitution, and it also holds powers that are not listed but are needed to carry out other powers. The Tenth Amendment to the U.S. Constitution, ratified in 1791, is crucial to dividing federal and state powers. It states that "the powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." This limits the federal government to the specific powers outlined in the Constitution and grants states any power that the Constitution has not assigned to the federal government or disallowed.
The U.S. Supreme Court plays a significant role in defining these powers by testing whether federal laws are constitutional. The Supreme Court's rulings have had a substantial impact on the expansion and restriction of federal authority throughout the country's history, including during the American Civil War and in the later 1800s and early 1900s. The "New Deal" in the 1930s strengthened the federal government, while changes in the 1980s returned some power to the states.
The federal government can also influence state actions by providing grants and mandates with strict instructions or conditions on how the funds are to be used. This has been observed in welfare programs and public education. Additionally, federal agencies such as the Drug Enforcement Administration (DEA) and the Food and Drug Administration (FDA) play a role in determining which substances are added to or removed from the CSA schedules. However, individual states retain some autonomy, as seen in the case of xylazine, where states like Ohio and West Virginia have scheduled the drug despite its lack of federal scheduling.
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The role of the DEA
The Controlled Substances Act (CSA) is a federal policy that regulates the manufacturing, distribution, importation, exportation, and use of controlled substances. The Act places all substances that were previously regulated under federal law into five schedules based on their medical use, potential for abuse, and safety or dependence liability. The CSA also allows for the regulation of chemicals that are used as precursors in the manufacture of controlled substances.
The Drug Enforcement Administration (DEA) is the agency responsible for enforcing the controlled substances laws and regulations of the United States. The DEA's mission is to bring to justice those organizations and individuals involved in the growing, manufacture, or distribution of controlled substances appearing in or destined for illicit traffic in the United States. The DEA also recommends and supports non-enforcement programs aimed at reducing the availability of illicit controlled substances on domestic and international markets.
The DEA's primary responsibilities include investigating and preparing for the prosecution of major violators of controlled substance laws, including drug gangs and violent criminals, at the interstate and international levels. They also manage a national drug intelligence program in cooperation with federal, state, local, and foreign officials to collect, analyze, and disseminate strategic and operational drug intelligence information.
The DEA also has the authority to initiate proceedings to add, delete, or change the schedule of a drug or other substances under the CSA. This is done based on factors such as the substance's potential for abuse, scientific evidence of its pharmacological effects, and its history and current pattern of abuse. The DEA works alongside the Food and Drug Administration (FDA) to determine which substances are added to or removed from the various schedules.
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Amendments and updates to the CSA
The Controlled Substances Act (CSA) is the federal statute that regulates the manufacture, distribution, importation, and use of controlled substances in the United States. It was enacted in 1970 by the 91st United States Congress and signed into law by President Richard Nixon. The CSA places all substances under the purview of existing federal law into one of five schedules based on their medical use, potential for abuse, safety, and dependence liability.
Since its original enactment, the CSA has undergone numerous amendments and updates to keep pace with the evolving nature of substance abuse and the ongoing effort to combat it. Here are some key amendments and updates to the CSA:
The Secure and Responsible Drug Disposal Act (2010)
This amendment allowed pharmacies to establish take-back programs for controlled substance medications. This was implemented in response to the growing opioid crisis in the United States, which had led to concerns about the safe disposal of these medications.
The Protecting Patient Access to Emergency Medications Act (2017)
This amendment included provisions for DEA registration for Emergency Medical Services (EMS) agencies, approved the use of standing orders, and outlined requirements for the maintenance and administration of controlled substances used by EMS agencies.
The Combat Methamphetamine Epidemic Act (2005)
Passed as an amendment to the Patriot Act renewal, this law addressed the growing issue of methamphetamine abuse. It placed comprehensive restrictions on the sale of medications containing precursor chemicals such as ephedrine and pseudoephedrine, which are commonly used in the manufacture of methamphetamine.
The Federal Analogue Act
This amendment targets substances that are "substantially similar" to those listed in Schedule I or II of the CSA. If these analogous substances are intended for human consumption, they are treated as if they were listed in Schedule I, which carries stricter controls.
Amendments to 21 CFR 1306.12 (2007)
Recognizing the burden on practitioners and patients when refills of Schedule II substances are not allowed for long-term treatment, this amendment allowed practitioners to write up to three prescriptions at once, providing a 90-day supply while adhering to specific guidelines.
The Synar Amendment to the Public Health Service Act
This amendment established the minimum purchasing age of 21 years for tobacco and electronic cigarette products in the United States. It is notable for addressing the issue of nicotine, a stimulant found in tobacco and e-cigarettes, and its role in substance regulation.
These amendments and updates to the CSA reflect the dynamic nature of substance control legislation, adapting to emerging challenges and scientific advancements in the field of controlled substances.
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Frequently asked questions
The Controlled Substances Act (CSA) is a federal policy that regulates the manufacturing, distribution, importation, exportation, and use of controlled substances. It was passed in 1970 by the 91st United States Congress and signed into law by President Richard Nixon. The CSA places substances under five schedules based on factors such as medical use, potential for abuse, and safety.
Substance laws at the federal level are determined by the Drug Enforcement Administration (DEA) and the Food and Drug Administration (FDA). These agencies decide which substances are added or removed from the schedules outlined in the Controlled Substances Act (CSA). The DEA also has the power to classify new drugs without a vote from Congress.
While federal laws set minimum requirements, state governments can impose stricter regulations or additional requirements for controlled substances. State laws can affect the discovery, development, and marketing of anti-addiction medications, particularly those that are controlled substances. Some states may also independently reschedule controlled substances or create their own schedules.









































