Because the number of positive cases is rising faster than the increase in testing. Also, make sure to split out the data per state/region. The decline from NY

Because the number of positive cases is rising faster than the increase in testing. Also, make sure to split out the data per state/region. The decline from NYC for example made up a huge amount of the decline. Otherwise you run into Simpson's Paradox. Miles Beckett did a decent Twitter thread on the topic: https://twitter.com/mbeckett/status/1278750652160634880 https://twitter.com/mbeckett/status/1278750652160634880