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[Find a single authority or court decision that holds that illicit drug use is an unemumerated right under the Ninth Amendment.]

Here is a Supreme Court decision rejecting the extension of the Interstate Commerce Clause to "closely connected" intrastate commerce.
OLIVER IRON MIN. CO. v. LORD, 262 U.S. 172 (1923):

"These are suits to restrain and prevent the enforcement of a taxing act adopted by the state of Minnesota, April 11, 1921. Chapter 223, Laws 1921..."
"The contentions made under the equal protection provision of the Fourteenth Amendment and under the state constitutional provision that 'taxes shall be uniform upon the same class of subjects' present a question or classification and have been argued together."

You get an F+. (I'm feeling generous.)

[Find a single authority or court decision that holds that illicit drug use is an unemumerated right under the Ninth Amendment.]

Which part of "Here is a Supreme Court decision rejecting the extension of the Interstate Commerce Clause to 'closely connected' intrastate commerce" did you not understand? Without that extension---which you have often voiced support for---the Controlled Substances Act, cornerstone of the federal War On Some Drugs, crumbles to dust, making the Ninth Amendment argument moot.