In New Jersey the bill passed both houses unanimously; in Montana the House voted 79-20 in favor while the Senate voted 46-1 in favor. Under the new law police departments remain free to purchase such materiel, but they would have to use their own funds (not federal grants), and they would have to notify the public about the intended purchase at least 14 days in advance.
The difference between the laws was spelled out by Mike Maharrey of the Tenth Amendment Center:
By making it a local decision, the New Jersey law is a great first step, but the Montana law takes things to the next level. It closes loopholes and covers almost all the bases.
The next step would be to expand the equipment banned, and we’re hopeful that the good people in Montana will work on that in the next session.