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In page Harrison Narcotics Tax Act:

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The "professional practice" clause was interpreted after 1917 to mean that a doctor could not prescribe opiates to an addict. Addicts and doctors were jailed for decades under theories adopted by the Narcotics Division that addiction could not be successfully treated in a clinical setting.[2] A number of doctors were arrested and some were imprisoned.[citation needed] The medical profession quickly learned not to supply opiates to addicts. In United States v. Doremus, 249 U.S. 86 (1919), the Supreme Court ruled that the Harrison Act was constitutional, and in Webb v. United States, 249 U.S. 96, 99 (1919) that physicians could not prescribe narcotics solely for maintenance.[3]