Count the evidence. According to the query search network, buying Maotai has invoices as evidence, and the evidence has three characteristics: authenticity, objectivity and relevance. Receipt invoice, regardless of its form, has legal effect and can be used as evidence in the legal sense as long as its content is clear, it can prove the fact of collecting money or receiving something, and it is signed by the payee or consignee. There is a lot of information on the invoice, such as the place to buy wine, the time to buy wine, the quantity to buy wine and so on.