An NBI clearance is a document issued by the National Bureau of Investigation that certifies that the applicant has no derogatory records with the bureau. The document is also known as an NBI clearance certificate.
The NBI clearance is valid for one year from the date of issue. After one year, the clearance expires and can no longer be used. Applicants who need to renew their clearance must reapply and go through the same process as first-time applicants.