There is any legal formality in uae to keep staffs...

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We would like to inform you that If your inquiry relates to a legal provision that employees hold passports with them, we refer to the following:
A passport is a personal document that is wholly owned by the passport holder and cannot be held by anyone else without the written consent of the passport owner and if any person retains the employee's passport without his written consent and refuses to return it at the request of the worker, the worker can file a complaint with the employer and the complaint is submitted to the police station and the Ministry of Human Resources and Emiratisation.

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