49 USC 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

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(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.