If additional information is needed from an applicant, which requirement is NOT a possibility?

The requirement to take an exam on private investigator law is not a possibility when additional information is needed from an applicant. After a candidate has already completed the requisite examinations involved in the licensing process, requiring them to retake or take an additional law exam would not be a standard practice for additional vetting.

The other options involve actions that may be appropriate or necessary to gather further information in a professional context. Presenting an attorney for questioning could pertain to legal representation during discussions about their application. Submitting to another background check may be required if there are concerns or if sufficient information has not been established. Providing sworn testimony is also a viable method to gather more information regarding an applicant's qualifications or background. In contrast, requiring an applicant to take an exam again does not align with common administrative practices in the field of private investigation.