Which of the following is NOT a reason for the credibility of an informer?

The reason that "the informer is well-known in the community" does not inherently contribute to the credibility of the information provided is that being well-known does not necessarily equate to reliability or truthfulness. An individual’s reputation might suggest familiarity or trustworthiness in some contexts, but it does not provide direct evidence that they are providing accurate or truthful information.

The other options emphasize characteristics or circumstances that can objectively reinforce the credibility of an informer. A motive to be truthful indicates a personal or situational incentive for the informer to provide accurate information. When the information is corroborated by other trusted sources, it adds an additional layer of validation, making it more reliable. Lastly, having personal knowledge suggests firsthand experience or information, which typically provides a stronger basis for credibility than mere popularity in the community.