Door to door.

Rhode Island Gov. Gina Raimondo announced during a press conference on Friday that the state would take drastic steps to “pin-point” individuals who had recently traveled to New York in an attempt to stem the spread of COVID-19, the disease caused by the novel coronavirus. ... Raimondo also announced that, starting Saturday, the National Guard will work with local law enforcement to go “door-to-door” in the state’s coastal communities, asking if anyone has come from New York and requesting their contact information.

Impressive. Efficient. And if they can do that, they can damn well find illegal aliens.