Video above: U.S. awards $231M contract for at-home virus testsJust 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