Measures, like doors that are locked at all times. But is that enough?
The school board is now debating whether bulletproof glass would be a smart addition to its new schools.
Sioux City superintendent Paul Gausman acknowledges the safety benefits, but says the price tag may be daunting.
Siouxland Safety Services is a company that assesses the security in area schools. We asked its vice-president Aaron Iacino whether bulletproof glass is the best option for increased school safety- "No, I think school resource officer would be more much well spent. Because they're not just good for active shooters and things like that but they help curve a lot of kids from going down bad paths."
There are currently six on-duty police officers for Sioux City's 23 schools. Superintendent Gausman says he's open to adding more.