It's a Material Thing.

Audits of a manufacturer's facilities prior to certification also occur under certain certification systems, allowing consumers to understand how a product or material is produced and providing a transparent view into the product's life cycle. Given its independence and transparency, third-party certification is especially valuable in bringing to market safer and more reliable products. Independent testing produces safer and more reliable products, it bolsters product acceptance in the marketplace and boosts consumer confidence, and it distinguishes manufacturers making compliant products. [Extracted from the article]