GS (Geprüfte Sicherheit) is the German term for "safety tested". An importer or manufacturer may place "ready-to-use" products into circulation or expose them in Germany with the GS mark. It is voluntary and may be granted to the products listed in the bulletin of the Federal Ministry of the Economy and Work. ZLS is the public body that accredits the GS Mark. "Product Safety Act" (ProdSG) replaced "Equipment and Product Safety Act" (GPSG) in 2011. It is the responsibility of test bodies to certify that safety and health requirements have been met. Furthermore, depending on the product, additional requirements may apply regarding noise, PAHs (Polycyclic Aromatic Hydrocarbons), and other prohibited substances.