What is a requirement for a confidential source's reliability according to the guidelines?

A key aspect of assessing a confidential source's reliability involves the requirement that the information provided must be corroborated, unless the source has been documented as reliable in past dealings. This means that investigators or officers should seek additional evidence or support for the information shared by the source to ensure its accuracy and credibility. If the source has a history of providing accurate information, they may be considered reliable without the need for further corroboration. This guideline helps maintain the integrity of investigative processes and ensures that action taken based on such information is justified and sound.

The other aspects presented do not serve as requirements for reliability. Ensuring complete anonymity or requiring personal information does not necessarily reflect the reliability of the source. Рather, corroboration or proven past reliability stands as a significant indicator of trustworthiness in the information provided.