Sometimes kids who ARE completely trained, have repeated accidents, as a response to being in school, or BECAUSE of school. My son, when he was three, had been fully trained by age 2 1/2, but when he went to school many months later, began to have repeated “accidents.” The teacher called us in to tell us he wasn’t ready for school, and it was only through careful questioning, that I determined the accidents were occuring within ten minutes of lunch time (during the “rest” period). After eating lunch, my son needed to go to the bathroom, but the teacher was being a zealot for “it’s rest period, now.” Not being able to go to the bathroom when he wanted to but still having to go, he would of course have an accident. Once I made the teacher see she was being unreasonable (he was the only one who needed to use the facilities, so it was not causing a disruption to the other kids who were resting), and he was allowed to go after lunch, there was never a recurrence.
So teachers, maybe some of you are the problem at least some of the time, not just the children who may be trained, but still need to adjust to being in school. I am sure you are correct that many kids go to school untrained, but treat each child’s case individually and try not to make assumptions.