The school was a former hunter facility but hadn't housed any vampires in several years. Or any other prisoners.
[Looks generally surprised.]
The Association is the only reason I stayed in school. They forced it on me, even if I skipped or slept through class I was forced to go for this past year. It's common for hunters to have a 'day' job. A lot of them have teaching licenses. I don't think it's the expiration date as much as the workload. There are nights where you don't get home until just about time to get to school. Doesn't leave much time for sleep.