They are defined as Schedule II controlled substances by the
Controlled Substances Act of 1970, which means that they have a
high potential for abuse in addition to legitimate medical
uses.
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The controlled substances Act
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In Canada drugs are regulated under the Controlled Drugs and
Substances Act, which can be viewed at the link below.
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Drugs such as Morphine and Meperidine (Demerol) are in the C-II
(Schedule 2) class