Campbell Covid Q1
If one state, say Arizona, substantially reduces social distancing, and another state, say California, does not, California’s efforts could be undercut by Arizonans traveling to California. There has to be a single national decision about when to end our shutdown. Purely as a practical matter, let alone a legal one, states cannot quarantine all travelers from other states. This is a textbook example of where a national approach is essential. It is, therefore, a mistake to say the decision is up to each state, with the federal role only advisory.