I am interested in the legalities of this. There are other areas where legality of a sale is dependent upon the seller's knowledge or beliefs about the buyer's

I am interested in the legalities of this. There are other areas where legality of a sale is dependent upon the seller's knowledge or beliefs about the buyer's intent. For example, drug paraphernalia… if you sell someone a pipe in Mississippi, and they don't say anything or they mention tobacco, that is fine. However if they said they wanted to use it to smoke cannabis, completing the sale would be distribution of drug paraphernalia, even though it's the same item.