Cashiers not doing their jobs

I do almost all my weekly shopping at this store. On average I am there at least 10 times a month. On a few occasions I got stopped by security at the exit because the security scanner goes off. Everyone looks at you like you tried to ***** something from the store. I understand that certain items have the scanners in them. The cashiers are supposed to \disable"it when they scan the item at the till. Why cant the cashiers be more responsible and do their jobs. Is it lack of training on Checkers side or incompetence on the cashiers side. Next time I will refuse to give my slip and they can do what they want. There is a sign stating that shoppers may be asked for their till slips but this sign is only viewable when you are leaving the store. If this is part of the terms and conditions of shopping at this store then shoppers should be able to view this sign upon entering the store. The shopper can then decide if they want to shop there or not.<br> <br> I was buying dog food I noticed that a lot of the cans have expired. This was for the \""Boss\"" brand. When I notified an employee he said just pick the cans that havent expired. What about removing them. Not all people look at the expiry date."""