So what's stopping Walmart from putting some simple verbiage in their supplier agreement that either: A) All subcontractors must be approved by Walmart Supplier Quality staff B) If additional temporary capacity is required, here is a list of approved Walmart subcontractors or C) If work is to be subcontracted, suppliers must ensure that subcontractors must meet or exceed all safety, codes, and legal requirements as original supplier that was audited. Yea, I know from experience that is hard to enforce, but it would at least give Walmart some goodwill in the public perception department if they're going to continue to claim plausible deniability.