There is 18 U.S. Code § 831,832, but it doesn't outright forbid owning a nuclear weapon. There is also the interesting issue of nonproliferation treaties to co

There is 18 U.S. Code § 831,832, but it doesn't outright forbid owning a nuclear weapon. There is also the interesting issue of nonproliferation treaties to consider. Could the US signing an arms agreement impact your second amendment rights - because those treaties would be enforceable against you? If you followed in the footsteps of David Hahn and ilk and avoid the environmental problems that got him in trouble, and built it yourself, you might be able to create and possess one legally. Theres probably some regulations in the CFR to look through too. Some law or regulation has to exist to regulate existing nuclear weapon production in the US.