"In Shell contracts, suppliers agree to provide and maintain safe and healthy working conditions for all supplier personnel. In conjunction with the Shell Supplier Principles, Shell companies have a Supplier Qualification System (SQS). Suppliers accept registration in SQS and, as a part of registration, are required to certify that they follow the Shell Supplier Principles or similar standards and their company complies with all applicable laws and regulations of the country or countries in which they do business." - Shell MSA Statement 2018 (pg. 2-3)

P.2-3 The statement lists clear expectations for suppliers.