A. Not scan, put all there stuff on other side, pay and ONLY then pack
B. Have a speed test, if they can't find bar code within certain amount of seconds, then they are not deemed fit and proper to use self service tills
C. Should not be allowed to let children scan items really slowly, whilst fighting their siblings for whose turn it is
Or should I just use the real person serving aisle?
This is light hearted! 