Storage of Shock Tube with Detonators - The Department of Justice is amending the regulations of the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) by allowing shock tube to be stored with detonators because these materials when stored together do not pose a mass detonation hazard. Shock tube is a small diameter plastic laminate tube coated with a very thin layer of explosive material. When initiated, it transmits a low energy wave from one point to another. The outer surface of the tube remains intact during and after functioning.