I can help you with Ma and NH.
NH: You can own and carry any thing, no restriction on blade length.
Ma: You can own anything, and you can carry anything with no restriction on blade length, except switch blades, durks, balisongs have a blade length limit of 1.5 in.
*Ballistic knives are illegal in all states.
LIVE FREE OR DIE!
“The beauty of the Second Amendment is that it will not be needed until they try to take it.”- Thomas Jefferson
“Disarm the people- that is the best and most effective way to enslave them.”- James Madison