Don't know the laws in NH, but if you have a lawn and garden department in a Lowes or in a Home Depot type retailer, then you have sodium nitrate as a listed ingredient on packages of fertilizer. Then you'd know real quick if NH outlaws sodium nitrate. Sodium Nitrate as a stand alone chemical can be purchased by consumers in 1# per calendar year according to rocketry guys I hang out with. It is a terrific oxidizer.