42 USCS 5160(b)
Liability: Cost of Care and Assistance
An individual who provides care or assistance in response to a disaster or emergency will not be responsible for costs incurred by the U.S. for the care or assistance.
Recovery of assistance
(b) Rendering of care. A person shall not be liable under this section for costs incurred by the United States as a result of actions taken or omitted by such person in the course of rendering care or assistance in response to a major disaster or emergency.