IU did this last year. Anyone commuting from outside Marion county was “randomly” selected. I was randomly selected 18 times to be tested. A friend of mine was tested once.
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Before I tested, I noticed the sign on campus asked you not to brush your teeth, drink water, or use mouthwash 30 minutes before you got the test. I thought that was weird. So I started brushing my teeth before I drove downtown, and I use mouthwash with alcohol right before I went in and took my test. I never tested positive for covid since then.
Dentists these days require an anti-viral rinse before treatments—they know that it kills the covid.
A good tip on testing!