WEST BLOOMFIELD, Mich. - More than a fifth of Detroit’s police force is quarantined; two officers have died from coronavirus and at least 39 have tested positive, including the chief of police. For the 2,200-person department, that has meant officers working doubles and swapping between units to fill patrols. And everyone has their temperature checked before they start work. An increasing number of police departments around the country are watching their ranks get sick as the number of coronavirus cases explodes across the U.S. The growing tally raises questions about how laws can and should be enforced during the pandemic,...