CVS became one of the first national retailers to experiment with self-checkout as a primary means of handling payment and bagging in stores. But the heavily guided process was error-prone and frustrating. By 2015, the drugstore retreated from the initiative, but it still offers a tweaked version of the stations in many stores. Costco had also removed self-checkout from its stores, although it began experimenting with it again in 2017. Nowadays, retailers ranging from major supermarkets to The Home Depot continue to offer self-checkouts, but there is often a store staffer nearby to assist with the inevitable glitch -- a product that won't scan, a coupon that won't activate, an exhortation to bag an item that has already been bagged.