DETROIT Mayor Mike Duggan is defending Detroits use of rapid testing kits now called into question by the U.S. Food and Drug Administration (FDA). The federal agency issued a warning that Abbot Labs 15-minute coronavirus (COVID-19) tests may be giving inaccurate results. Whitmer: There are enough Michigan coronavirus (COVID-19) deaths to fill Fox TheatreThere are concerns that the Abbot tests give a negative result when a patient is actually positive. Duggan said the citys medical director tested samples at a state lab -- looking for false negatives. Duggan said various tests are being used in Detroit and the city continues to check the temperature and symptoms of workers.