49 C.F.R. § 1572.21
(b) Fingerprint-based check. The following procedures must be completed to conduct a fingerprint-based CHRC:
(2) During enrollment, TSA—
(c) Intelligence-related check. To conduct an intelligence-related check, TSA completes the following procedures:
(d) Final disposition. Following completion of the procedures described in paragraphs (b) and/or (c) of this section, the following procedures apply, as appropriate:
(2) TSA serves an Initial Determination of Threat Assessment on the applicant if TSA determines that the applicant does not meet the security threat assessment standards described in 49 CFR 1572.5. The Initial Determination of Threat Assessment includes—
(3) TSA serves an Initial Determination of Threat Assessment and Immediate Revocation on the applicant, the applicant's employer where appropriate, the FMSC, and in the case of a mariner applying for a TWIC, on the Coast Guard, if TSA determines that the applicant does not meet the security threat assessment standards described in 49 CFR 1572.5 and may pose an imminent security threat. The Initial Determination of Threat Assessment and Immediate Revocation includes—