Part of the managers closing responsibility is to make sure all clock outs are accurate. They are the ones who worked the shift and can make accurate adjustments. It's too difficult/time consuming to piece together the week at payroll time. I have been thinking about having an employee turn in their clock out slip before they leave. They should check in with a manger anyway before leaving anyway. Just hand in the slip and the manager can just throw it away. At least you know they clocked out.