I'm sure not all arrests are unconstitutional, since arrest is mentioned in the Constitution among the things that can be done under certain circumstances. What I would like to consider is where in the Constitution was the power to arrest anybody for any thing in any State, delegated to the the United States. That is not what you said. No tax or duty shall be laid on articles exported from any state. I see no mention of arrest or enforcment.
Regulation has to do with making rules.
Though rules may or may not be enforced the power to enforce rules is not the same as the power to make the rules, and the power to enforce the rules is not delegated to the United States here. If no provision whatsoever was made for the enforcment of federal laws then one might suspect that the founding fathers intended for the United States to go into the State and force the people or the State to obey them but provision was made. Can you identify the provision.