And crime is not a national concern? How else will police be equipped to take down an active shooter? How will they be equipped to crack down on the opioid crisis? How will they be equipped and trained to crack down on your own biggest boogeyman, illegal immigrants? Muslims and those uppity Negroes?
For a group that shouts "law and order?", you sure have wacky notions on how to make that happen. You willingly pay for national defense. What about the threats heroes face right here at home?
State law enforcement agencies should be funded by the State, counties and localities. Remember this:
The powers reserved to the several States will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people, and the internal order, improvement, and prosperity of the State. -James Madison Federalist 45
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Two errors in your judgment.
First, the Federalist Papers are not the law of the land. The founding fathers were not infallible. They built in the option of changing and amending the constitution at the will of the people. The Federalist Papers amounts to commentary, but not precedent.
And James Madison knew nothing about how this nation would eventually grow and drive the economy, security and viability of the world. There were no corporations in Madison's time. Nothing more hazardous than a back yard forge or a water driven saw mill.
If corporations are people too, they can certainly bear standards that not only protect their own property and employees, but their neighbors and the health and safety of those who show up to help that corporation's disaster.
You have yet to come up with a viable argument why the States and localities are incapable of instituting regulations they feel are necessary in this regard.
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For the reasons I worked with for twenty years.
I am an Environmental engineer by training. I'm retired now.
Back in my Environmental days, I would have projects at U.S. Navy bases up and down the east coast. From Quincy, MA to Hampton Roads, VA. I can tell you that the service-wide standards in the Navy made my projects go much smoother. The bidding process for local contractors went especially smoothly. Their employees, methods and materials were consistent all along the coast.
I also had private sector clients in many of the same states. Every facility had to be considered for contractor and employee licensing requirements, hazardous waste disposal facilities, even PELs (Personal Exposure Limits). All that added to the cost and, ultimately, the assurance of quality workmanship when dealing with hazardous materials.