How secure are US schools?

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it's a distrubing fact that US schools are not secured enough that gunmen are able to do senseless killings similar to the Virginia Tech shootings. how secure are they? This kind of incident has been repeated over and over and still, authorities and even school administrative bodies have been lax in beefing up their security for the safety of the students. what i've noticed is the fact that majority of the schools in the US are open, no gates, no high walls to keep outsiders and even those who intend to do harm from enetring the school premises, like the ones we have here. here, we have such a tight security on campuses, the chances of your getting anything close to being called a deadly weapon as small as a compact cutter will be questioned and confiscated upon entry. the reality is that anyone can easily get a fire arm in the US and i believe this is a huge problem and should be the main concern of US authorities to address the other issues related to gun control problems. what are your thoughts on this issue? floor is open.