Final answer:
The sale of alcohol at self-checkout stations is generally prohibited to ensure proper age verification and compliance with local laws, although some systems may allow it with employee oversight.
Step-by-step explanation:
The statement that you can't sell alcohol at self-checkout stations is mostly true. Regulations on the sale of alcohol vary from place to place, but in many areas, the sale of alcohol must be supervised by a store employee to ensure that the purchaser is of legal drinking age. While some self-checkout stations may be equipped with systems that require an employee to check the customer's ID before the purchase is authorized, in general, the sale of alcohol is restricted at self-service stations to prevent underage sales and other issues related to alcohol distribution.