I work in a school and it's always the dirty children that carry the nits.. we had a meeting about it as the TAs were getting fed up getting infected and evidently, we're not allowed to look in a child's hair if we suspect anything as it's invading their personal space.... One teacher did insist on telling a parent in person, rather than waiting to hand out a subtle letter as she could see the nits crawling on his neck
I can't believe they're not allowed to check a child’s head for lice.
That is normal practice in the US . If they see your child scratching their head all day, that child WILL be checked for lice and sent home immediately.
And you are right; it was the "dirty haired kids" spreading the lice. A mother who washes her child’s hair is going to notice if bugs are crawling around OR eggs are attached to the child’s head.
But...another problem is mothers (or fathers) with
A. bad eyesight or
B. a big old case of denial
My very own mother had both. My 2 year old niece had lice. The same time that MY kids had lice at Disneyland, I told my mother the kid had lice; she said "Oh, she has NO such thing!"
Fast forward a couple months, I take my mother to the hospital. I'm sitting in the cafeteria with 2 year old niece. (By now the lice are so big; they are as large as fleas)
I am mortified when I see a flea sized lice crawling down the kids forehead....right there in public.
See, it's been over 20 years and i'm still traumatized. lol