49 C.F.R. § 1572.107 – Other analyses.

(a) TSA may determine that an applicant poses a security threat based on a search of the following databases:
1. (1) Interpol and other international databases, as appropriate.
2. (2) Terrorist watchlists and related databases.
3. (3) Any other databases relevant to determining whether an applicant poses, or is suspected of posing, a security threat, or that confirm an applicant's identity.
(b) TSA may also determine that an applicant poses a security threat, if the search conducted under this part reveals extensive foreign or domestic criminal convictions, a conviction for a serious crime not listed in 49 CFR 1572.103, or a period of foreign or domestic imprisonment that exceeds 365 consecutive days.