This has a specific legal implication known as "product substitution." If a product is described by specification in any way, the specification becomes its legal identity, such that the provision of any of the product that does not meet the specification is considered a "product substitution." A bogus product. A fraudulent product. In this case, an adulterated product, containing substances not in its specification. This is the basis of legal claims against defense contractors who deliver products that are not within specification or have failed proof or quality assurance testing.