You could always scan the organic green beans as the cheaper non-organic variety if you wanted to but it's such minor theft (saves a few cents per dollar) that it's neither worth doing nor worth policing which is pretty similar to how honesty boxes work in reality.

The obvious thing to me is that weight checks used to be annoyingly stringent--e.g. weigh your reusable bags. Aside from some employee keeping an eye on things I don't see anything like that around where I live any longer.