Not necessarily. It would be very cost prohibitive to test every attribute of every lot of all incoming material. And quality control studies have shown that you can't inspect quality into a product, but instead build quality in.
So most leading manufacturers have transitioned away from incoming inspection as a method to control the quality of incoming material, instead partnering closely with their suppliers, and contractually obligating the supplier to build quality into their product, and provide data to show compliance. It used to be that a supplier may have to submit certification data with each shipment. But these days, certification data will be submitted when a product is new, but later, only when the customer requests data.
No manufacturer intentionally selects a supplier that they think will cheat and lie to them.