investigations and security clearance determinations for an applicant that have been conducted by a State, local, or Tribal Government if the Secretary can verify that those previous investigations and determinations, as the case may be, are of a comparable quality and thoroughness to investigations and determinations carried out by the Bureau of Indian Affairs, the Office of Personnel Management, or another Federal agency. (iii) Additional investigation If, as described in clause (i), the Secretary considers an existing background investigation, security clearance determination, or both, as the case may be, for an applicant that has been carried out by a State, local, or Tribal Government, or by the Bureau of Indian Affairs, the Secretary— (I) may carry out additional investigation and examination of the applicant if the Secretary determines that such additional information is needed in order to make an appropriate determination as to the character and trustworthiness of the applicant before final adjudication can be made and a security clearance can be issued