HOW Did Cruz get through the door at the "east stairwell of building 12"?

Watch this psy-op: [link at the bottom]

"An arrest report makes it clear that staffers at Marjory Stoneman Douglas High immediately recognized Nikolas Cruz as a “former troubled student” as he emerged Wednesday from a small gold Uber car, carrying a black duffel bag and wearing a black hat. One staffer radioed a co-worker to alert authorities that Cruz was “walking purposefully” toward the school in Parkland.

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"But within seconds, it was too late. Cruz, according to an arrest report, methodically began firing an AR-15 assault rifle that had been stashed in the bag, methodically mowing down students and adults in the hallways. As chaos ensued, Cruz admitted to homicide detectives, the gunman ditched the gun to “blend into the crowd” fleeing the school.

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"That afternoon, Broward authorities say Cruz took the Uber to his former school, carrying a black duffel bag with his rifle and plenty of extra ammo.
According to Israel, the shooter at 2:19 p.m. entered the east stairwell of building 12, walking back and forth into classrooms firing. He went to a second story, fired into classroom 1234, then fled to the third story, where he dropped the bag and the weapon."


What happened to their great security plans?

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[link to www.miamiherald.com]