The negligence exception is hard to understand. I guess the over the top good faith interpretation is that it is meant to transfer liability to the school? But there's no reason to shield the employer from civil liability in the case of negligence.

The rest of the changes to the Iowa law don't seem particularly egregious:

https://www.legis.iowa.gov/legislation/BillBook?ba=SF167&ga=...

It's hard to read, but it seems like the change related to meat packing allows 14 and 15 years to package meat in a cooler, where before they would have to do it in a room that wasn't a cooler? Like there's a provision in the under 18 section about no work in slaughter, meat packing and rendering, but an exception for assembly.

Like fine, there isn't really that much need to do a nuanced read of how involved a 14 year old should be in packing meat, but the change to the law there doesn't seem very big, essentially updating it to allow for modern practices (with the caveat that I read it in a reasonably correct way, I'm not gonna argue very hard that I did...).