Is it illegal to send nucleic acid test paper to customers? How to deal with it?

It is not illegal and does not need to be dealt with. Nucleic acid test paper can be bought in pharmacies and given away through transactions, so it is not illegal and does not need to be handled. Nucleic acid is a kind of genetic material, which is essential for living things, namely DNA and RNA. You can determine whether you are infected with a disease through nucleic acid testing.