What a Vendor Cannot Prove About Itself

Short answer: A seller can show you documents, policies and records. There are specific questions no amount of self-published material can settle, and recognising which ones they are stops you reading confidence as evidence.

Anything requiring an independent party

Whether a laboratory is real, whether a report resolves on that laboratory's own system, whether an accreditation is current — none of these can be settled by the seller, because the seller is the interested party. They can point you at the check; they cannot be the check.

This is why a report hosted as a PDF on a vendor's own site is a weaker document than the same report resolving on the laboratory's portal, even when both contain identical text.

What happens when something goes wrong

A policy describes an intention. How a seller behaves during an actual dispute is observable only during one, and the sellers with the worst records all have policies that read fine. A small first order, tracked and documented, buys this information at a price you set.

That the material in YOUR parcel matches the tested lot

A certificate describes a sample. Linking it to your unit requires a lot reference printed on the item and matching the document. Without that chain the certificate is a statement about an unnamed sample, and no amount of confident presentation closes the gap.

Long-run consistency, if they are new

A seller trading six months cannot demonstrate four years of consistency, and a claim implying otherwise is the thing to notice. Age is weak evidence, and absence of age is not a flaw — overstating it is.

Why confidence on these questions is a signal

A seller who answers 'can I verify that independently' with reassurance rather than a route has told you something. The useful reply is a link, a reference number or a name you can check. Anything else is an answer to a different question.

How we handle it in scoring

Criteria that depend on the seller's own word are rated on whether an independent route exists, not on how firmly the claim is made. Where no route exists we record it as unconfirmed, which is neither a pass nor a failure but an accurate description of what can be known.