49 C.F.R. § 109.1
For purposes of this part, all terms defined in 49 U.S.C. 5102 are used in their statutory meaning. Other terms used in this part are defined as follows:
Administrator means the head of any operating administration within the Department of Transportation, and includes the Administrators of the Federal Aviation Administration, Federal Motor Carrier Safety Administration, Federal Railroad Administration, and Pipeline and Hazardous Materials Safety Administration, to whom the Secretary has delegated authority in part 1 of this title, and any person within an operating administration to whom an Administrator has delegated authority to carry out this part.
Agent of the Secretary or agent means a Federal officer, employee, or agent authorized by the Secretary to conduct inspections or investigations under the Federal hazardous material transportation law.
Chief Safety Officer or CSO means the Assistant Administrator of the Pipeline and Hazardous Materials Safety Administration.
Emergency order means an emergency restriction, prohibition, recall, or out-of-service order set forth in writing.
Freight container means a package configured as a reusable container that has a volume of 64 cubic feet or more, designed and constructed to permit being lifted with its contents intact and intended primarily for containment of smaller packages (in unit form) during transportation.
Immediately adjacent means a packaging that is in direct contact with the hazardous material or is otherwise the primary means of containment of the hazardous material.
Imminent hazard means the existence of a condition relating to hazardous material that presents a substantial likelihood that death, serious illness, severe personal injury, or a substantial endangerment to health, property, or the environment may occur before the reasonably foreseeable completion date of a formal proceeding begun to lessen the risk of that death, illness, injury, or endangerment.
In writing means unless otherwise specified, the written expression of any actions related to this part, rendered in paper or digital format, and delivered in person; via facsimile, commercial delivery, U.S. Mail; or electronically.
Objectively reasonable and articulable belief means a belief based on particularized and identifiable facts that provide an objective basis to believe or suspect that a package may contain a hazardous material.
Out-of-service order means a written requirement issued by the Secretary, or a designee, that an aircraft, vessel, motor vehicle, train, railcar, locomotive, other vehicle, transport unit, transport vehicle, freight container, portable tank, or other package not be moved or cease operations until specified conditions have been met.
Packaging means a receptacle and any other components or materials necessary for the receptacle to perform its containment function in conformance with the minimum packing requirements of this subchapter. For radioactive materials packaging, see § 173.403 of subchapter C of this chapter.
Perishable hazardous material means a hazardous material that is subject to significant risk of speedy decay, deterioration, or spoilage, or hazardous materials consigned for medical use, in the prevention, treatment, or cure of a disease or condition in human beings or animals where expeditious shipment and delivery meets a critical medical need.
Properly qualified personnel means a company, partnership, proprietorship, or individual who is technically qualified to perform designated tasks necessary to assist an agent in inspecting, examining, opening, removing, testing, or transporting packages.
Related packages means any packages in a shipment, series or group of packages that can be traced to a common nexus of facts, including, but not limited to: The same offeror or packaging manufacturer; the same hazard communications information (marking, labeling, shipping documentation); or other reasonable and articulable facts that may lead an agent to believe such packages are related to a package that may pose an imminent hazard. Packages that are located within the same trailer, freight container, unit load device, etc. as a package removed subject to this enhanced authority without additional facts to substantiate its nexus to an imminent hazard are not "related packages" for purposes of removal. The related packages must also demonstrate that they may pose an imminent hazard. They must exhibit a commonality or nexus of origin, which may include, but are not limited to, a common offeror, package manufacturer, marking, labeling, shipping documentation, hazard communications, etc.
Remove means to keep a package from entering the stream of transportation in commerce; to take a package out of the stream of transportation in commerce by physically detaining a package that was offered for transportation in commerce; or stopping a package from continuing in transportation in commerce.
Safe and expeditious means prudent measures or procedures designed to minimize delay.
49 C.F.R. §109.1