It isn't about the cell phones.
I wish that you would look at the bigger picture here. I would think that your wish of spending tax dollars on enforcing dumb, pointless rules would take a back seat to the more important issue of graduation rates and test scores. Students would likely learn more if they weren't forced to obey pointless rules. My argument behind that is if they were treated with any amount of respect and weren't greeted at school with screaming cops and administrators restricting their creativity for absolutely no reason, then they would be more likely to stay in school and learn.
For the first two years I was in high school, I had a great principal who wasn't strict about things like this. Everyone was happier, attendance rates were great, and it was all around a good school. After that though, he was promoted to superintendent and one of the assistant principals took over and started ridiculous rules and brought in cops to get mad over nothing in particular, and the school has been hell ever since.
I never got into any major trouble in school and I graduated with a 3.7 GPA, but I've seen oppression in schools, seen what it can do, and I don't like it.