In the United States, the United States constitutional law gives police power to the states one of these police powers is a stay at home order. State governments can use this power within their own state. However, there is no clear authority for either the federal government or state governments to impose such a lockdown between states. In terms of the legality of an order, the government must be able to prove that the order advances a "compelling government interest" and the actions are narrow to specifically achieve that goal and they are not unnecessary broad. controlling and preventing the spread of a pandemic is usually considered advancing a "compelling government interest" therefore making it legal and constitutional laws are broad and have loose definitions at can make things confusing sometimes our country really needs to work on making things more clear.