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Can a security guard be absent from work for half an hour?

Excuse me, do I have to ask the security guard if I leave my post for half an hour without permission? Security guards who leave their posts for half an hour without authorization can be regarded as absenteeism. The system of asking for leave for security team members stipulates one of them: those who leave their posts without permission shall be punished as absenteeism. Security guards must ask for leave before leaving their posts. Leaving one's post without authorization may cause job loss or accident.