Thoughts of Columbine, Virginia Tech and Sandy Hook still haunt many teachers and children.
They are the same thoughts that keep school administrators and law enforcement continually searching for new ways to keep schools safe.
"The national incidents certainly raise our awareness and the fact that we're in a society where our doors can't just all be open all the time," said Jourdanton Independent School District Superintendent Lana Collavo.
She admits she is always looking for something to make it just a little bit safer.
"Over the last few years, we've added lighting, we've added fencing, we've added locks," Collavo said.
In the next few weeks JISD will be adding CopSync91 -- a new system that would allow teachers to click on an icon on their computer in the classroom and immediately alert the five closest officers that there's a threat at the school.
The teacher will also have the opportunity to type an explanation of the alert. If that doesn't happen in 10 seconds, the alert will send anyway.
CopSync911 will also simultaneously send a text message to five designated people.
"We will be able to have law enforcement present at the school, in the case of an emergency, in less than half the time," Atascosa County Sheriff David Soward said.
"The person that you're calling about, or the incident, they don't know what you're doing. You can quietly summon help without escalating a situation, and you can do it really quickly," Collavo said.
With a system like this, the perpetrator could be the last to know law enforcement is on the way.