If a government can proscribe a weed, it can certainly proscribe say, ammunition or the components of ammunition.
We must be concerned with the health and safety of our population, mustn't we?
No they can't. Ownership of such items is specifically protected by the U.S. Constitution under Amendment II. Apart from that, drug usage is an activity that constitutes a reckless endangerment to the public.
We must be concerned with the health and safety of our population, mustn't we?
Absolutely. Just as we control the spread of diseases, we must also keep the spread of this disease (drug usage) under control.