I do scan as you shop. So when I get to the checkout, answer a question about whether everything scanned OK and then pay. But today we had 70+ items in our shop and got flagged for random spot check. Some exasperated cashier, frustrated she actually had to do some work and couldn't just sit there having excess calories around her waist weighing her down heavily breathed "I need to check 40+ of these". So that took forever.
I didn't, never do, but saw her the shop before shouting at a colleague who was overwhelmed and asking for help. She genuinely seemed to be allergic to work.