It’s not easy for potato growers and processors to always ensure food safety or meet customers’ specified standards. For one thing, all sorts of foreign materials get mixed up with potatoes when they’re harvested. For another, any batch is likely to contain some potatoes (and perhaps many) that are sub -standard. And when these unwanted materials get into a processing line’s product stream, they can be almost impossible to detect - yet business reputations depend on eliminating them.