Can you purchase ammo and firearms if you are under the influence of any other narcotic —legal (vicodin) or other?

This is another situation in which government bans on reserach leave us only with current law —which is woefully inadequate.

If the use of a particular drug returns one to homeostasis, then why would a person be able to purchase firearms or drive without being under the influence of that drug.

Because we don’t know —the research has not been done.

Until then we remain cautious.