Foreign material control, especially metal contamination, has become an integral element of food quality and safety programs. But, no matter what processors do to ensure the foods they manufacture are free from metal and other foreign materials, there are instances when something gets into that final package.
Metal detectors and X-ray machines do not detect all metals, only metal or other materials down to a certain size. The sensitivity of the metal detector or X-ray machine depends on its design and the type of product being tested.