9.—(1) The proper authority may require any person to whom section 31 of the Act applies to produce his passport or other travel document for inspection.
(2) Any person who applies for an exit permit shall produce such evidence as the proper authority may require to support his application.
(3) Where any requisition is made by the proper authority under paragraph (1), the person concerned shall produce the passport or other travel document within 7 days of the date of the requisition.
(4) The proper authority may retain any passport or other travel document submitted pursuant to paragraph (1) and any documentary evidence submitted in support of an application for an exit permit.
(5) A person shall produce his passport or other travel document for inspection by the proper authority when he reports his return to Singapore.