I still haven't found anything about hair cuts for foster kids in my manual.
I did however come across some other interesting rules I didn't know about.
1. All clothing purchased for a foster child must go with them when they leave your home, this includes clothing they have outgrown.
2. Medical assistance health insurance for foster children doesn't reimburse doctors as well as private insurance. To help make this up to your foster child's doctor please take your biological children this doctor too.