I think it's worth noting that Walmart's self-checkout is incredibly more robust than many competitors. What I've seen of Safeway, each item has like a 5% chanc

I think it's worth noting that Walmart's self-checkout is incredibly more robust than many competitors. What I've seen of Safeway, each item has like a 5% chance of needing an employee to clear an error state, which usually means a two minute wait per error.