At which point they are acting in their official duty as a law enforcement officer so would be able to legally enter. They cannot carry a weapon into a federal office while on personal business. LEOSA does not provide an exemption for entering federal buildings
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After he said he could not comply the security officer attempted to arrest him. Drawing a weapon to arrest someone obviously armed is allowed. In any case I watched the video and he did not point his weapon at his back. He held his weapon at low ready with his finger outside the trigger guard