(Adriana Zehbrauskas | The New York Times) Navajo Police Department officers at a road block in Window Rock, Ariz., April 3, 2020, in response to the coronavirus pandemic. Faced with one of the most alarming spikes in coronavirus deaths in the United States, Navajo officials are putting up checkpoints, assembling field hospitals and threatening curfew violators with 30 days in jail or a $1,000 fine.