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Analog Drug Laws
"Designer Drugs", Analogue, CSA
The U.S. "Analog" / "Analogue" drug laws are laws that are designed to control (make illegal) chemicals that are similar in chemical structure to listed controlled drugs, but which themselves are not yet listed in the laws and regulations.

Note on spelling: The U.S. Federal Analogue Act spells the term "analogue", although this is an archaic spelling not normally used in U.S. English. Other laws, such as the California State Analog act and most discussions of the concept fall back on the more standard, modern "analog" spelling.