on a friday night. whit, thank you. as many have said, one of the keys to reopening the country may be testing for antibodies to see if americans had been exposed to the virus and might have some immunity. it would offer some reassurance as families decide if it's safe to go back to work. tonight we're with the researchers with the experimental test checking for antibodies, a simple pinprick. tonight, the government, do they have the ability to get tens of millions of tests ready and quickly? here's abc's kaylee hartung tonight. >> reporter: tonight, on the front lines of a key battle in the fight to get america back to work. a line of people in northern california waiting for an antibody test to determine whether they have been exposed to the coronavirus without knowing it and may now be immune. >> the key to reopening is going to be testing. >> reporter: the antibody testing in california, part of a usc-stanford study, requires just a drop of blood, a simple pinprick. they say it costs about 10 bucks and results are available in