Can someone explain the law of proxy sales to me please? I work in a supermarket where we operate challenge 25 policy, I saw a young boy and 2 girls down the alcohol isle chatting and pointing at different alcohol. The boy then comes through self checkout and the two girls walk off. I believed it to be a proxy sale and that he was selling for a minor but asked my manager first to get her opinion. She said if I don’t actually hear them asking him to buy them alcohol then I can’t refuse the sale. I understand this totally I’m just intrigued whether it’s just our company policy or if you can only call it a proxy sale if you hear the conversation regardless of what you believe has happened?