Authority and Scope
CDC has the legal authority to detain any person who may have an infectious disease that is specified by Executive Order to be quarantinable. If necessary, CDC can deny ill persons with these diseases entry to the United States. CDC also can have them admitted to a hospital or confined to a home for a certain amount of time to prevent the spread of disease.
U.S. Port Health Stations | Quarantine | CDC
U.S. Port Health Station are part of a comprehensive system that serves to limit the introduction and spread of contagious diseases in the United States. They are located at 20 ports of entry and land-border crossings where most international travelers arrive.
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