School resource officer Mike Bennis communicates with Portland High School administrators on a radio.

School resource officer Mike Bennis mans his post in the hallway at Portland High School as students return

School resource officer Mike Bennis mans his post in the cafeteria at Portland High School during breakfast Thursday.

School resource officer Mike Bennis shares a laugh with Riley LaRose during lunch break.

Portland High School student Beyonce Peters chats with School resource officer Mike Bennis in the hallway during lunch break.

Portland High School student Joe Pike chats with School resource officer Mike Bennis in the hallway during lunch break.

Portland High School student Trey Roberts fist bumps School resource officer Mike Bennis in the hallway during lunch break.

A bulletin board in Mike Bennis' office at Portland High School displays notes of gratitude from students.

School resource officer Mike Bennis talks to Portland High School students in the hallway about a conflict with another student.

Mike Bennis and Alfredine Brito wave to each other before the start of classes Thursday morning at Portland High School.