As a teacher, in the last few years before I retired, we had to have a note from a Dr. if we missed more than 2 days in a row.
As someone who had perfect attendance many school years I thought it insulting, but funny, b/c people would take off 2 days for being sick, instead of the one needed.
Before I knew about this rule, since I rarely called in sick for a day, after being out for 2 weeks b/c of surgery, I went back to school, and was sent home b/c I didn't have a note from the Dr. to be able to return.
I laughed the whole time I was off that day, getting a Dr.'s note to go back to school like I was a kid that could be faking it.
Another time when I had been out really really sick for a couple of days, they reminded me to get a Dr.'s note before I returned.
I was going back to school the next day, but the Dr. said I should stay home for 2-3 more day.
So I did (I had 180 sick days saved up anyway).
We don't even get 2 days. If we call off just one shift, we must "justify" it.