Here he claims he used to substitute teach:
I used to sub. Every sub can tell you both horror stories and great stories about how different assignments went. The day and class you’d get depended alot upon the school, the kids, and the regular teacher. Most schools require regular teachers to leave lesson plans and a “sub folder” which has things like the seating chart, schedule, and info about the kids. How up to date and complete it was varied alot. Heck sometimes the class basically ran itself.