21 C.F.R. § 600.90
(a) An applicant may ask the Food and Drug Administration to waive under this section any requirement that applies to the applicant under §§ 600.80 and 600.81. A waiver request under this section is required to be submitted with supporting documentation. The waiver request is required to contain one of the following:
(b) FDA may grant a waiver if it finds one of the following:
[59 FR 54042, Oct. 27, 1994, as amended at 79 FR 33092, June 10, 2014]