Evidence becomes misleading when it is asked to prove more than it can. A professional credential may support qualification in a defined field but not every claim the professional makes. A case example can document an outcome but not prove that the same outcome will occur generally. A registry can establish an identifier without proving licensure.
An evidence boundary makes the limit explicit. The source is recorded alongside the proposition it can support. If the public statement becomes broader, a stronger or different source may be required.
This is particularly important in health-related publishing because the FTC expects appropriate scientific substantiation for objective health claims. It is equally useful in ordinary business authority because it prevents convenient but weak evidence from becoming universal proof.
Evidence boundaries also simplify maintenance. If a source is withdrawn or superseded, the system can identify which claims depend on it rather than assuming every article is affected.
Authority becomes more credible when it includes the discipline to say what is not proven.