Its all a result of zero tolerance policies being tolerated. School administrators aren't required to think. Treating a kid the same for bringing Ibuprofen as another kid who brings meth is insanity. Much the same as elementary kids being expelled for bringing a GIjoe toy gun, applying the same policy as if the kid brought his dad's class III in.
It was worse than that 10 years ago when I was in HS. I heard of getting suspended for bringing in a metal butterknife in one's lunch.
My favorite policy is the violence policy at every school I am familiar with. Both parties are punished, and in most cases, punished equally. If someone jumps on you, starts beating the every livin' heck out of you and you do absolutely nothing, you got suspended as well.
Interestingly, this very policy was what lead me on a spiritual, moral and philosophically journey. I was a pacifist as a kid. I didn't so much disagree with violence on a moral level (that too), but mostly I thought it was an insanely inefficient means of resolving issues. Mind you, I hit 6 by the time I was 14 or so, so my nickname was "the gentle giant". You'd think size alone would deter bullies. Quite the contrary, they thought it was hysterical to punch or kick someone literally twice their size who would not do anything in return.
So, one day a kid was assaulting me and it dawned on me that I was wrong. Pacifist is the inefficient and immoral path, not violence. In an instant, I changed my entire spiritual outlook and decided violence was the correct spiritual path. So I broke the kid's arm, two ribs, fractured his skull by ramming it into a cinder block wall repeatedly, and then threw him down a flight of concrete stairs. Violent, sure. But one act of concentrated violence stopped every future act of violence. Viola, efficiency. My philosophy changed to NEVER attack first, but always reply to an attack with overwhelming and extremely disportional violence in order to stop future violence. It has served me quite well in my career and life thus far.
Had it not been for the Lord of the Flies environment fostered by public school policies, I would be a less moral and philosophical person than I am today.