Since this is from my city, I can fill in a couple of details
First, from
another thread on this that slipped under the radar, to quote myself:
The issue's still going pretty hot here, with lots of opinion/editorials posted pretty much every day. So far public opinion seems pretty evenly divided, but it's hard to tell from the news.
To me the issue is not on a per-teacher basis - as one of the editorials pointed out today, if this woman is in fear of her life, and is around kids, then the school is responsible to protect the kids around her. I say more power to her.
The part that had me worried was from a different perspective: Most people didn't know that a CHL (Concealed handgun license, in OR) was an exception to the ban on firearms in and around schools. I only found out because I did my own homework, and stumbled across this useful bit of information.
For those who aren't familiar with the process in OR, the exception is at a federal level,
See 18 D.S.C. § 922 (q) (2) (B) (ii). But, as I understand, the States have the right to remove the exemption. Oregon has simply kept quiet on the issue.
I was afraid that this would outrage a lot of people who think that a school is truly a gun-free area - but I was wrong. The exemption doesn't seem to be bothering many people. Apparently, some people tried to remove the exemption a couple of years ago, and failed.
Most of what we are getting is the old "what if she is totally irresponsible?" kind of questions, where people are afraid that a student is going to get a hold of the gun, because you know, us gun nuts apparently don't know how to keep control of our own weapon, and are likely to leave it laying around in a classroom somewhere.

One of the dumber questions that's come up is "where is she going to keep it? In her desk? In her purse under the desk?" Yeah, she's going through all the trouble to bring a gun to work, to leave it in her desk. Uh-huh.
Besides, it's "obviously impossible" that said evil students who are salivating over the chance to steal a teacher's gun could never just bring one from home, but have all of their hopes on a future life of crime pinned on a forgetful moment of their teacher.
As to the questions about the 18 Y.O -- in Oregon, 21 is the legal age for owning/carrying a handgun, and you cannot get a CCW until you are 21.
However,
anyone who has a CCW can carry a loaded, concealed pistol onto school grounds, even into a classroom full of students, or an assembly.
(And no, cops don't have to check in their pistols at the front desk).
It falls under the same category as carrying it into a mall, or movie theater. If the owners/managers have a sign barring firearms, and you carry one in concealed, you are not breaking a law. However, if they find out that you have it, they may ask you to leave, or take the gun to your car. If you refuse, then it becomes more of a trespassing-type issue. At least, that's how it was explained at the safety course I took to get the CCW. If I carried my gun into my wife's school (she's a middle school teacher), I'm in a perfectly legal position, but if they know it's there, they can ask me to leave it in the car, but they can't call the police and arrest me for having a gun on school property. But they would probably try. Make sense?
She's trying to widen this understanding, and actually setting a precedent for more of an issue of - if you carry concealed while at your job (whatever it is, public or private), can you get fired for it? The news stories have made it clear over and over again that she already has the legal right to carry it -- the question is whether she can be fired for it.
It's telling, though, that the superintendent, a retired cop, issued a statement saying that if she brought the gun to school, she would be arrested. They would have nothing to charge her with!
This is one main source of confusion, here, and some of the arguments going on locally don't distinguish between the two.
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On another note, South Medford High School is one of two High schools in the area where gang activity is growing, and growing very, very fast. It's one of the lower-income schools, with a lot of people moving in from S. California. It's not so much a terrorist threat we're talking about, but the problem of a Columbine-style massacre is a definite threat here.
It was not long ago that one happened in Eugene, only a couple of hours from here, and in the same type of community. It's also very common for kids to get expelled for bringing pistols to school -- it happened last year to one
of my wife's own students, in
Middle School! Somebody reported it, and they found it in her locker. It turned out to be an airsoft pistol, but she had brought to intimidate other students.
No, this place is ripe for school-shootings, and S. Medford is the likeliest place. Perhaps not a massacre, but a gang-related shooting is very likely.
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BTW, since the exemption is at a federal level, you all should check your state laws about CCW on schools, your state may be the same as Oregon, but it's not widely known.