WASHINGTON — Just five weeks ago, Los Angeles County was conducting more than 350,000 weekly coronavirus tests, including at a massive drive-thru site at Dodger Stadium, as health workers raced to contain the worst COVID-19 hotspot in the U.S. Now, county officials say testing has nearly collapsed. More than 180 government-supported sites are operating at only a third of their capacity. “It’s shocking how quickly we’ve gone from moving at 100 miles an hour to about 25,” said Dr.