The Los Angeles City School District
, and the Los Angeles Community College District
both have a FULL TIME POLICE Departments since like the 1970's. Think the Colleges are now policed by LASD.
A very good friend worked for the City School District, and was a Full Time Cops at one of the High Schools in LA.
He wore a Coat & Tie to bled in like the other staff, but being very truthful it was not a Coat & Tie job. Now they are in uniform.