In carrying out their responsibilities under the 1916 NPS Organic Act and other pertinent statutes, all NPS officials and employees must be knowledgeable about the laws, regulations, and policies that pertain to their work. The property clause of the U.S. Constitution gives Congress the authority to develop laws governing the management of the National Park Service system. The property clause specifically directs that “The Congress will have the Power to dispose of and make all needful Rules and Regulations respecting the Territory or other Property belonging to the United States.”(article IV, section3) Once laws are enacted, authority for interpreting and implementing them is delegated to appropriate levels of government. In carrying out this function, the Park Service, like other federal agencies, develops policy to interpret the ambiguities of the law and to fill in the details left unaddressed by Congress in statutes.