WOW, blast from the past.
Prohibitional power has never been granted to any level of government, federal/state or local.
I can see the federal argument, as always, but you have yet to prove that STATES are prohibited from criminalizing material that they see as harmful enough to violate the rights of other citizens.
Article VI clearly says that State laws & constitutions notwithstanding, our US Constitution is the "Law of the Land".
The 10th says that powers are prohibited by it [the Constitution] to the States. -- Powers to deprive people of rights to life, liberty, or property without due process of law.
Thus, police powers that infringe on individual rights are Constitutionally prohibited.
Tex, this is not a complicated matter at all. -- Why would you want States to have the power to prohibit guns?