Originally Posted by orangello
...Purchases from a FFL require the buyer to complete a federal form 4473, but private purchases between individuals do not require this form to be completed. If a occaisional pot smoker bought a shotgun from a full-time pot non-smoker, would either of them be subject to the sanctions previously discussed in this thread?
The buyer commits a federal felony by being an useful user of a controlled substance in possession of a gun. And the seller might for selling it to him, but only if the seller can be shown to have had reasonable grounds for believing that the buyer was a prohibited person.