They are part of a program in which police officers teach the students how to solve problems without violence.
Friday, the officers gave students one last bit of advice.
"If you hear or know anybody in the school with a gun, tell someone. We talked about people you can trust and these are the people I want you to turn to when things are going wrong," Cheryl Clark of the Chicago Police Department said.
Starting Sunday night on our news at 10, we'll take a look at what is being done to stop the violence. It's a week long series of special reports throughout our newscasts.