This is the paranoid part. The grits now pass through a machine with lasers or high-speed cameras. Every piece is scanned for color, size, and shape.
How Are Grits Manufactured , What are Grits? – EPYPCY
Anything that isn’t a perfect, golden grit chunk gets blasted out with a jet of air. A dark spot? A fleck of bran? A stray piece of rock? Gone. It’s like the TSA for grits, but way more effective.