The U.S. Food and Drug Administration issued an emergency authorization on Saturday allowing public use of a saliva-based test for the coronavirus developed at Yale University and funded by the NBA and the National Basketball Players Association. The test, known as SalivaDirect, is designed for widespread public screening. The cost per sample could be as low as about $4, though the cost to consumers will likely be higher than that — perhaps around $15 or $20 in some cases, according to expert sources.