Lawyer here. Without searching cases, a quick look at the CFR makes me believe both
@T & R and
@Intr3pid are right. Note that I have zero experience with CDC regulations, so take this for what it is worth.
@Intr3pid is right that the CDC only has authority to control the spread of disease across U.S. borders and state borders. For the CDC to issue a quarantine, for example, it must find that the individual is "moving or about to move from a State into another State." Similar restrictions exist in other parts of the regulations.
On the other hand, like @T&R said, the feds interpret the above requirement very broadly (just like the Commerce Clause), and the regulations allow them to restrict completely intrastate travel of quarantined individuals.
- §70.5 (b)(2)(d) The Director may additionally apply the provisions in paragraphs (a) through (c) of this section to individuals traveling entirely intrastate and to conveyances that transport such individuals upon the request of a State or local health authority of jurisdiction.
and
- §70.5 (b)(2)(e) The Director may additionally apply the provisions in paragraphs (a) through of this section (c) to individuals traveling interstate or entirely intrastate and to conveyances that transport such individuals whenever the Director makes a determination under 42 CFR 70.2 that based on the existence of inadequate local control such measures are needed to prevent the spread of any of the communicable diseases from such State or U.S. territory to any other State or U.S. territory.
Another regulations allows the CDC to supersede local authorities with protective measures when it determines they aren't doing enough:
- §70.2 Measures in the event of inadequate local control. Whenever the Director of the Centers for Disease Control and Prevention determines that the measures taken by health authorities of any State or possession (including political subdivisions thereof) are insufficient to prevent the spread of any of the communicable diseases from such State or possession to any other State or possession, he/she may take such measures to prevent such spread of the diseases as he/she deems reasonably necessary, including inspection, fumigation, disinfection, sanitation, pest extermination, and destruction of animals or articles believed to be sources of infection.
While the CDC would need to show the risk caused by the local inaction was to surrounding states, it would be an extremely low bar given existing case law on the Commerce Clause. For example, the Supreme Court found a man planting his own garden for his own consumption, and not even selling it, fell within the fed's authority to regulate under the Commerce Clause. It would be very easy for the CDC to say a particular state's COVID-19 outbreak was significant enough to spill over into other states.
Also notice the how broad the CDC's authority is. It can take "such measures" as it deems reasonable.
On a side note, I find it interesting that the the CDC cannot quarantine healthy individuals, because it must find the individual is "believed to be infected with a quarantinable communicable disease in a qualifying stage." Does anyone no which section of the code it relies on to ban cruising of non-quarantined individuals? It might be §70.2 above, but I suspect there is something more specific. I will have to look into that.
EDIT: The CDC is relying on 42 C.F.R. 71.32(b) primarily. It's a major stretch in my opinion. It reads:
- (a) Whenever the Director has reason to believe that any arriving person is infected with or has been exposed to any of the communicable diseases listed in an Executive Order, as provided under section 361(b) of the Public Health Service Act, he/she may isolate, quarantine, or place the person under surveillance and may order disinfection or disinfestation, fumigation, as he/she considers necessary to prevent the introduction, transmission or spread of the listed communicable diseases. Executive Order 13295, of April 4, 2003, as provided under section 361 of the Public Health Service Act (42 U.S.C. 264), and as amended by Executive Order 13375 of April 1, 2005, contains the current revised list of quarantinable communicable diseases, and may be obtained at http://www.cdc.gov and http://www.archives.gov/federal- register. If this Order is amended, HHS will enforce that amended order immediately and update this reference.
It basically makes the argument that the passengers are already infected or may become infected. I don't see anything in the regulations allowing such action for a group of people that may become infected in the future. It also relies on 70.2 above, as I thought it might, and essentially says, "we don't think the locals are likely to do enough to control this from interstate spread, so we can do this."