DOT Rule 49 CFR Part 40 Section 40.51
Subpart D - Collection Sites, Forms, Equipment and Supplies Used in DOT Urine and Oral Fluid Collections
§ 40.51 What materials are used to send oral fluid specimens to the laboratory?
(a) Except as provided in paragraph (b) of this section, you must use a shipping container that adequately protects the specimen bottles from damage in the transport of specimens from the collection site to the laboratory.
(b) You are not required to use a shipping container if a laboratory courier hand-delivers the specimens from the collection site to the laboratory.