The district approved the changes last week, but moved up the start date after a student was shot and killed over the weekend.
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There has been an increased police presence around the school Wednesday morning, and some nerves from students.
Owen Levitt just moved back to Highland Park. He was ready for his first day of school, but said he has never dealt with a security process like this.
"I think it'll be a little of a change, probably an unfortunate necessary change, but hopefully will better the safety of students and staff," said Levitt, who just moved back from Arizona.
Parents have been able to speak with school administrators about the security system, which went into effect Wednesday, but has been a request from parents since someone brought a gun to school last April.
The weapons security system is being implemented in Highland Park first before Deerfield High School adds it as well.
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One of the school's three entrances has the security system.
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The process is very similar to the security seen at any major event.
Originally, the school district planned a slower rollout to help students navigate the process, but plans were expedited after Sunday's shooting death of a Highland Park High School student.
The district superintendent said it will be a learning process.
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"It's gonna probably be a little bumpy to get used to at first, bumpier than it would've been had we had the opportunity to teach them how to move through it efficiently and quickly, but we think the trade-off is worth it," District 113 Superintendent Bruce Law said. "We knew we had to adapt to the situation and putting ourselves in the place of parents and students who are thinking about coming to school.
Parents dropping their kids off said this security measure helps ease the worry of any additional tragedy happening and are hoping all three entrances of the school can soon have this security system.
"I would prefer every single entrance; that's better, just to be safe. Everyone has to safe," parent Evelia Munoz said.
Law said the system could be added to all three entrances in the future, but first the plan is to learn from the story of this process and adapt from there.