Thou shall not call in sick

My son is a teacher and I was too at one point in my life.  At the time I thought it was a very hard job and it is in many respects. It is also a job that pays extremely well for the amount of time one spends actually working and has vacations that the private sector can only dream about. Further and it is a big "further" because there is a bit of a fuss over salaries, benefits are a big part of the fee structure.

There was an article about some teachers in NYC who were fired because they called in sick when indeed they were taking vacation days.
To be fair, sometimes teachers need what we used to call "mental health days" and call in sick just because. However, in a profession that works 9.5 months a year with two sets of major holidays (Christmas and spring breaks), 10 or so national holidays and who knows how many other local days reducing instructional years to 180 or so teaching days (roughly 20 days of work a month for 9.5 months) you really don't have to cheat.