Well, I took the more direct route and yelled at him in his face...I seriously did.
I told him that HE was responsible to take notice of the children that came to his school every day. HE was responsible to notice if they wore the same pair of shoes every day and their toes had busted out the ends and were an inch past the end of the shoe. I yelled at him that if they came into the building eating a pop tart he should walk up to them and say "Hey, there's extra breakfast this morning, I am really needing some kids to man up and come eat it so we don't have to throw it out" and I yelled at him that kids that wore the same clothes over and over and over every day might not have any other clothes at home or they might not have been able to go home for several days and HE should at least ask them if they're okay.
I told him that HE has a responsibility to SEE and HEAR and LISTEN and WATCH and ACT on his gut. If he had the decency to have one...he didn't like that one much.
But anyway. My grandson was in DHS custody within a few days and eventually was adopted by my ex and his wife. They were already raising grandson #2 and I had granddaughter #1 and grandson #3 in my home. Later on the next two, granddaughter #2 and grandson #4 were adopted by their foster family, then grandson #5 was born while my daughter was in rehab. She's been great since and has Grandsons #1, 2, 3, and 5 living with her for the last 2 years. I have the older girl and that younger girl and boy are still with the adoptive foster family.
So I didn't call the state or the police or the teacher or anyone else. I told off the principal and told him that I wasn't with the kids every day and didn't see their conditions and that HE was, that HE was legally and morally responsible for all that was going on with the kids in HIS care.