Cuomo: Visitors To NY Must Show Negative COVID Test

The New York Daily News reports:

Travelers arriving in New York from non-neighboring states will have to quarantine and undergo mandatory coronavirus testing as cases spike across the country, Gov. Cuomo announced Saturday.

The governor said New York will require inbound travelers to show a negative COVID-19 test from three days or less before they arrive or be subject to a 14-day self quarantine.

With a negative test, they would still be expected to quarantine for a week but can end their isolation after four days if they test negative a second time. The rules would not apply to people arriving from states that border New York, including New Jersey, Connecticut and Pennsylvania.

How could this be enforced?