From the document: "During a lapse in appropriations, also referred to a federal funding hiatus, the Department of Homeland Security (DHS) must be able to cease its government operations in an orderly fashion. Only those functions and activities that are exempt or excepted from the work restrictions specified in the Anti-Deficiency Act (ADA) may continue during a lapse in appropriations. The ADA essentially codifies the Constitutional requirement that 'No Money shall be drawn from the Treasury, but in consequence of appropriations made by Law.' Federal officials are prohibited from incurring obligations, to include entering into contracts or grants, or performing activities in the absence of a currently available appropriation, unless authorized by law. The Act further restricts acceptance of voluntary services or personal services beyond authorized levels 'except for emergencies involving the safety of human life or the protection of property.' As a result, only activities that are exempt or qualify as excepted may continue to operate during a lapse in appropriations."