CPS official Robert Christlieb publicly credits a school building engineer with inventing the device tried out in several CPS schools but does not mention he’s a co-inventor.
CPS
Police Reports: School Officials Blocked Cops Access to Video Surveillance and Discouraged Witness From Cooperating After Fatal Shooting on Campus
The records, obtained by the Illinois Answers Project, provide greater detail on the clash between CPS and CPD at Juarez High School where four students had been shot, two fatally .
CPS Principal, Staff Stymied Police Investigation of Mass Shooting at Pilsen High School, Emails, Interviews Show
In the first crucial hours, police could not get access to video surveillance, a witness and other key information in a shooting that left two students dead, two wounded. CPS says it cooperated.
Records Raise Questions on CPS Transparency Over Near South Side High School Plan
Chicago Public Schools promised to listen to residents concerning the school location but did closed door planning for months. Appraisals for purchased land differ by millions of dollars, records show.

