Oregon Senator tries to ensure that school children remain easy targets...

Senator Ginny Burdick of Oregon apparently thinks that law-abiding citizens are more dangerous than psychopaths:

"'I'm talking about Sally the reading mom who happens to leave her purse behind' with a gun inside, Burdick said."

Exactly how many times has this happened in Oregon, or anywhere else for that matter? And how many times have things like this and this happened?

Update: Or this?

Update #2: Or even this?