Things are sure different at my daughter's school. She's in 4th grade, 9 years old, and I often send a knife in her lunch bag so that she can prepare sandwiches (she likes to keep the sandwich components separate so they don't mush together before lunchtime). Sure, it's a relatively dull butter knife style of knife, but there's been no big deal about it.
Even more amazing to me, two years ago there was a biography project at school. She was portraying Annie Oakley, the sharpshooter. How can you present Annie Oakley without a rifle? So we asked permission to bring in a fake rifle and the school was OK with it. We made it out of painted cardboard and PVC pipe. Even though we asked permission, I was kind of prepared for someone to freak out, but again, it was no big deal.
This is in California. I'm glad not every place is as paralyzed with fear as it sometimes seems.