"A well-regulated militia, being Necessary to the security of a FREE STATE, the right OF THE PEOPLE to Keep and Bear Arms SHALL NOT BE INFRINGED."
I don't see it there.
The Suspension Clause of the United States Constitution specifically included the English common law procedure in Article One, Section 9, clause 2, which states:
The privilege of the writ of habeas corpus shall not be suspended, unless when in cases of rebellion or invasion the public safety may require it.”
Which in the case of the aftermath of Katrina required it, it was lawful according to the Constitution to ban firearms.