The Trump administration announced a plan yesterday to ramp up coronavirus testing. But even as it announces this new push, the Federal government has pushed much of the responsibility for testing to states. Experts say the lack of Federal leadership has led to a free-for-all, where states compete to get their hands on tests, and few states are left in a good position to reopen. Emma Court and John Tozzi report on the difficult logistics required to mount a meaningful testing operation.