Before relying on a report, examine its type and the relevant narrator conditions. Treating a solitary report as if it necessarily provided the same certainty as tawatur, or rejecting it merely because it is solitary, both disregard the book's classification.
Similarly, broad popular agreement is not automatically juristic ijma, and resemblance between two cases is not automatically qiyas without a valid common effective cause. The label of evidence never substitutes for proving that its conditions are met.