DETROIT – Throughout the pandemic, the White House has relied on rapid testing to protect the president from the coronavirus. If you layer the precautions on top of each other, you can block most of the holes. But if you rely on a single layer the virus can easily slip through. Rapid tests in particular tend to have a higher rate of “false negatives.” That’s when someone tests negative, but are actually positive. For those two reasons relying on frequent testing alone leaves holes the virus can slip through.