Dear Tony,
But do note that a (possible) exception was also indicated, eg -
They [Physical hazards] are materials that are not part of the product or expected by the consumer to be found in the product.
This kind of distinction also turns up in other fields IMEX. For example, pure
haccp usually focuses on "dangerous" bones in processed fish fillets. However in commercial practice, a separation can occur between retail products which are defined/labelled as "deboned" as compared to, often non-retail, product simply labelled fish fillets. "Bones" in the latter is often a contractual spec., eg assessed by a scoring method. Although if an incident actually occurred, one wonders ....
I suppose the infamous "may contain" is almost irresistable where not specifically forbidden. Especially if product is distributed in a litigious-prone vicinity perhaps.
Rgds / Charles.C