Think of how useless a COVID test is. It's only good for the amount of time between when the swab is taken (not when the results come back) and when the next person coughs on you or you touch what an infected person did.
Swab - sample taken away to lab - coughed on - infected - test results come back negative - "Congratulations, you're clear. Proceed as planned to go about your work." (Walking among others and spreading COVID the whole way).
A buddy of mine gets tested for his job at an off-site location every morning but is exposed to hundreds of people before he even reaches the job site. It's asinine.
I think it is administrators with nothing to do that want to appear that they are doing something. Maybe it is CYA or just some eggheads advertising how much of a douche they can be