I travel to the US frequently as do many of my colleagues. I've never heard of such a case. You usually see the door to the interview rooms and last time I coul

I travel to the US frequently as do many of my colleagues. I've never heard of such a case. You usually see the door to the interview rooms and last time I could see it while I was in the queue, I believe no one except employees entered it while at least 200 people entered the country. Not significant but would assume it's very rare. Considering how many people enter the country each day, even a 1:10000 chance would produce a lot of cases.