Millions of rapid COVID tests are going unused.
That's according to a review by the Wall Street Journal.
This is a problem because most of these tests have expiration dates.
At the end of 2020, the federal government sent states 142 million rapid tests.
As of early this month, 32 million of them are still sitting.
Some state public health leaders say there hasn't been a demand for the tests because other forms of testing are already in place.
