Backwards. They have that power unless their state constitutions prohibit it.
[Produce a single authority or court decision holding that drug laws violate the 10th Amendment.]
I couldn't care less what authorities who act outside their lawful mandates think.
Your position is baseless.
His position is firmly grounded in the plain text of the Constitution; yours teeters atop the doubletalk of an FDR-cowed Supreme Court. (How you have the gall to present your position as conservative is beyond me.)
According to the federal Constitution, states can have that power.
However, you ignore the design of constitutions in our country. Your interpretation is akin to that of China, where subjects may only do what is specifically allowed, and governments can do anything not prohibited.
That is diametrically opposed to our form of government.
Your position is baseless.
My position is that laws contrary to the Constitution are null and void. Authorities have no legitimate power to act outside their legal mandate. The Constitution created their offices, and it defines and limits the powers of those offices.