46 C.F.R. § 13.115
Each applicant for an original tank vessel endorsement must provide evidence of having passed a chemical test for dangerous drugs or of qualifying for an exemption from testing in § 16.220 of this subchapter as specified in § 10.225(b)(5) of this subchapter.
[USCG-2004-17914, 78 FR 77988, Dec. 24, 2013]