49 U.S.C. § 5104: Representation and tampering

(a) Representation.—A person may represent, by marking or otherwise, that—(1) a package, component of a package, or packaging for transporting hazardous material is safe, certified, or complies with this chapter only if the package, component of a package, or packaging meets the requirements of each applicable regulation prescribed under this chapter; or (2) hazardous material is present in a package, container, motor vehicle, rail freight car, aircraft, or vessel only if the material is present. (b) Tampering.—No person may alter, remove, destroy, or otherwise tamper unlawfully with—(1) a marking, label, placard, or description on a document required under this chapter or a regulation prescribed under this chapter; or (2) a package, component of a package, or packaging, container, motor vehicle, rail freight car, aircraft, or vessel used to transport hazardous material.