I don’t know. I think that substitutes should be watched pretty closely. They are unfamiliar with the class and with the routine. If this teacher was able to show a 2-3 hour video to her class, she probably wasn’t being adequately supervised. As a permanent teacher, I would be questioned if my class was watching a video for that length of time.
Of course, she might have been a long term sub, which is different. Hopefully, there is no way this woman will ever be allowed inside a school again.
Nonetheless, the damage is done and now the school district (as in taxpayers) will pay for any judgements meted out by the court. Very sad all around and pretty daggone stupid too.