Was it measured before and after? Or did they take a couple of anecdotes (from people with a vested interest, at that) as fact?

Outcomes meaning test scores, behavior, mental health. I have two kids in NYC high schools including at least one of the schools they were canvassing at. They have not observed any changes. My oldest used to use her phone for schoolwork during the day pretty frequently and now she can't, so homework is taking longer.

It's more that parents are afraid of not being in contact with their child when a school shooting happens. It's not some far flung thing in America unfortunately.

To be fair, the title has been editorialized.

From the guidelines: “…please use the original title, unless it is misleading or linkbait; don't editorialize.”

(I’ve flagged. Happy to unflag once title is fixed.)

https://news.ycombinator.com/newsguidelines.html

Yes I understand it's in the article, but that wasn't my point.

People from all over the world read this site and many won't click on articles they aren't sure are relevant to them... why can't we put even the location of the story in the title? Is that too much to ask?