Copyright 2020 NPR. To see more, visit https://www.npr.org.

Editor's note: NPR will be publishing stories from this investigative series in the weeks ahead as we focus our current coverage on the coronavirus pandemic. But here's a look at some of our key findings. You can watch the full documentary film from this investigation right now on the PBS series Frontline.

Copyright 2020 NPR. To see more, visit https://www.npr.org.

Copyright 2020 NPR. To see more, visit https://www.npr.org.

Copyright 2020 NPR. To see more, visit https://www.npr.org.

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